食事性ナトリウム、食餌性ナトリウム、食物性ナトリウム、食品中ナトリウム

WordNet

of or relating to the diet; "dietary restrictions" (同)dietetic, dietetical
a regulated daily food allowance
a silvery soft waxy metallic element of the alkali metal group; occurs abundantly in natural compounds (especially in salt water); burns with a yellow flame and reacts violently in water; occurs in sea water and in the mineral halite (rock salt) (同)Na, atomic number 11

PrepTutorEJDIC

食事の;規定食の,食養生の / 規定食,特別食
ソジウム,ナトリウム(金属元素;化学記号はNa)

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出典(authority):フリー百科事典『ウィキペディア（Wikipedia）』「2015/10/19 22:10:54」(JST)

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Sodium /ˈsoʊdiəm/^[4] is a chemical element with symbol Na (from New Latin natrium) and atomic number 11. It is a soft, silver-white, highly reactive metal. In the Periodic table it is in column 1 (alkali metals), and shares with the other six elements in that column that it has a single electron in its outer shell, which it readily donates, creating a positively charged atom - a cation. Its only stable isotope is ²³Na. The free metal does not occur in nature, but instead must be prepared from its compounds. Sodium is the sixth most abundant element in the Earth's crust, and exists in numerous minerals such as feldspars, sodalite and rock salt (NaCl). Many salts of sodium are highly water-soluble: sodium ions have been leached by the action of water from the earth's minerals over eons, so that sodium (and chlorine) are the most common dissolved elements by weight in the oceans.

Sodium was first isolated by Humphry Davy in 1807 by the electrolysis of sodium hydroxide. Many sodium compounds are useful, such as sodium hydroxide (lye) for soap-making and sodium chloride for use as a de-icing agent and a nutrient (edible salt).

Sodium is an essential element for all animals and some plants. Sodium ions are the major cation in the extracellular fluid (ECF) and as such are the major contributor to the ECF osmotic pressure, and thus ECF compartment volume. Loss of only water from the ECF compartment increases the sodium concentration: hypernatremia. Isotonic loss of water and sodium from the ECF compartment decreases the size of that compartment: ECF hypovolemia.

Sodium ions are pumped out of cells by Na+/K+-ATPase in exchange for potassium. It pumps three sodium ions out of the cell for every two potassium ions pumped in, contributing to the fact that about forty times as much potassium is inside cells compared to outside, and about ten times as much sodium is outside cells compared to inside. In nerve cells, a buildup of electrical charge across the cell membrane allows transmission of a nerve impulse - an action potential - when the charge is dissipated.

1 Characteristics
- 1.1 Physical
- 1.2 Chemical
- 1.3 Isotopes
- 1.4 Occurrence
2 Compounds
- 2.1 Aqueous solutions
- 2.2 Electrides and sodides
- 2.3 Organosodium compounds
3 History
4 Commercial production
5 Applications
- 5.1 Free element
  - 5.1.1 Heat transfer
6 Biological role
7 Precautions
8 See also
9 References
10 External links

Characteristics

Physical

Sodium at standard temperature and pressure is a soft silvery metal that oxidizes to grayish white unless immersed in oil or inert gas. Sodium can be readily cut with a knife and is a good conductor of electricity and heat. These properties change dramatically at elevated pressures: at 1.5 Mbar, the color changes from silvery metallic to black; at 1.9 Mbar the material becomes transparent with a red color; and at 3 Mbar sodium is a clear and transparent solid. All of these high-pressure allotropes are insulators and electrides.^[5]

When sodium or its compounds are introduced into a flame, they turn it yellow,^[6] because the excited 3s electrons of sodium emit a photon when they fall from 3p to 3s; the wavelength of this photon corresponds to the D line at 589.3 nm. Spin-orbit interactions involving the electron in the 3p orbital split the D line into two; hyperfine structures involving both orbitals cause many more lines.^[7]

Chemical

Emission spectrum for sodium, showing the D line.

A positive flame test for sodium has a bright yellow color.

When freshly cut, sodium has a bright, silvery luster. If exposed to air, the surface rapidly tarnishes, darkening at first and then forming a white coating of sodium hydroxide and sodium carbonate.

Sodium is generally less reactive than potassium and more reactive than lithium.^[8] Like all the alkali metals, it reacts exothermically with water, to the point that sufficiently large pieces melt to a sphere and may explode; this reaction produces caustic soda (sodium hydroxide) and flammable hydrogen gas. When burned in dry air, it mainly forms sodium peroxide as well as some sodium oxide. In moist air, sodium hydroxide results.^[9] Sodium metal is highly reducing, with the reduction of sodium ions requiring −2.71 volts.^[10] Hence, the extraction of sodium metal from its compounds (such as with sodium chloride) uses a significant amount of energy.^[9] However, potassium and lithium have even more negative potentials.^[11]

Isotopes

Twenty isotopes of sodium are known, but only ²³Na is stable. Two radioactive, cosmogenic isotopes are the byproduct of cosmic ray spallation: ²²Na with a half-life of 2.6 years and ²⁴Na with a half-life of 15 hours; all other isotopes have a half-life of less than one minute.^[12] Two nuclear isomers have been discovered, the longer-lived one being ^24mNa with a half-life of around 20.2 microseconds. Acute neutron radiation, such as from a nuclear criticality accident, converts some of the stable ²³Na in human blood to ²⁴Na; by measuring the concentration of ²⁴Na in relation to ²³Na, the neutron radiation dosage of the victim can be calculated.^[13]

Occurrence

²³Na is created in the carbon-burning process in stars by fusing two carbon atoms together; this requires temperatures above 600 megakelvins and a star of at least three solar masses.^[14] The Earth's crust contains 2.6% sodium by weight, making it the sixth most abundant element on Earth.^[15] Because of its high reactivity, it is never found as a pure element. It is found in many different minerals, some very soluble, such as halite and natron, others much less soluble such as amphibole, and zeolite. The insolubility of certain sodium minerals such as cryolite and feldspar arises from their polymeric anions, which in the case of feldspar is a polysilicate. In the interstellar medium, sodium is identified by the D spectral line; though it has a high vaporization temperature, its abundance allowed it to be detected by Mariner 10 in Mercury's atmosphere.^[16] Sodium has been detected in at least one comet; astronomers observing Comet Hale-Bopp in 1997 observed a sodium tail, which consisted of neutral atoms (not ions) and extended to some 50 million kilometres in length.^[17]

Compounds

Structure of sodium chloride, showing octahedral coordination around Na⁺ and Cl⁻ centres. This framework disintegrates upon dissolution in water and reassembles upon evaporation.

Sodium compounds are of immense commercial importance, being particularly central to industries producing glass, paper, soap, and textiles.^[18] The sodium compounds that are the most important include table salt (NaCl), soda ash (Na₂CO₃), baking soda (NaHCO₃), caustic soda (NaOH), sodium nitrate (NaNO₃), di- and tri-sodium phosphates, sodium thiosulfate (Na₂S₂O₃·5H₂O), and borax (Na₂B₄O₇·10H₂O).^[19] In its compounds, sodium is usually ionically bonded to water and anions, and is viewed as a hard Lewis acid.^[20]

Two equivalent images of the chemical structure of sodium stearate, a typical soap.

Most soaps are sodium salts of fatty acids. Sodium soaps are harder (higher melting) soaps than potassium soaps.^[19] Sodium chloride is extensively used for anti-icing and de-icing and as a preservative; sodium bicarbonate is mainly used for cooking. Along with potassium, many important medicines have sodium added to improve their bioavailability; although in most cases potassium is the better ion, sodium is selected for its lower price and atomic weight.^[21]Sodium hydride is used as a base for various reactions (such as the aldol reaction) in organic chemistry, and as a reducing agent in inorganic chemistry.^[22]

Aqueous solutions

Sodium tends to form water-soluble compounds, such as halides, sulfates, nitrates, carboxylates and carbonates. The main aqueous species are the aquo complexes [Na(H₂O)_n]⁺, where n = 4–6.^[23] The high affinity of sodium for oxygen-based ligands is the basis of crown ethers; macrolide antibiotics, which interfere with Na⁺ transport in the infecting organism, are functionally related and more complex.^{[citation needed]}

Direct precipitation of sodium salts from aqueous solutions is rare because sodium salts typically have a high affinity for water; an exception is sodium bismuthate (NaBiO₃).^[24] Because of this, sodium salts are usually isolated as solids by evaporation or by precipitation with an organic solvent, such as ethanol; for example, only 0.35 g/L of sodium chloride will dissolve in ethanol.^[25] Crown ethers, like 15-crown-5, may be used as a phase-transfer catalyst.^[26]

Sodium content in bulk may be determined by treating with a large excess of uranyl zinc acetate; the hexahydrate (UO₂)₂ZnNa(CH₃CO₂)·6H₂O precipitates and can be weighed. Caesium and rubidium do not interfere with this reaction, but potassium and lithium do.^[27] Lower concentrations of sodium may be determined by atomic absorption spectrophotometry^[28] or by potentiometry using ion-selective electrodes.^[29]

Electrides and sodides

Like the other alkali metals, sodium dissolves in ammonia and some amines to give deeply colored solutions; evaporation of these solutions leaves a shiny film of metallic sodium. The solutions contain the coordination complex (Na(NH₃)₆)⁺, whose positive charge is counterbalanced by electrons as anions; cryptands permit the isolation of these complexes as crystalline solids. Cryptands, like crown ethers and other ionophores, have a high affinity for the sodium ion; derivatives of the alkalide Na⁻ are obtainable^[30] by the addition of cryptands to solutions of sodium in ammonia via disproportionation.^[31]

Organosodium compounds

The structure of the complex of sodium (Na⁺, shown in yellow) and the antibiotic monensin-A.

Many organosodium compounds have been prepared. Because of the high polarity of the C-Na bonds, they behave like sources of carbanions (salts with organic anions). Some well known derivatives include sodium cyclopentadienide (NaC₅H₅) and trityl sodium ((C₆H₅)₃CNa).^[32]

History

Salt has been an important commodity in human activities, as shown by the English word salary, which derives from salarium, the wafers of salt sometimes given to Roman soldiers along with their other wages. In medieval Europe, a compound of sodium with the Latin name of sodanum was used as a headache remedy. The name sodium is thought to originate from the Arabic suda , meaning headache, as the headache-alleviating properties of sodium carbonate or soda were well known in early times.^[33] The chemical abbreviation for sodium was first published by Jöns Jakob Berzelius in his system of atomic symbols,^[34] and is a contraction of the element's New Latin name natrium, which refers to the Egyptian natron,^[33] a natural mineral salt primarily made of hydrated sodium carbonate. Natron historically had several important industrial and household uses, later eclipsed by other sodium compounds. Although sodium, sometimes called soda, had long been recognised in compounds, the metal itself was not isolated until 1807 by Sir Humphry Davy through the electrolysis of sodium hydroxide.^[35]^[36]

Sodium imparts an intense yellow color to flames. As early as 1860, Kirchhoff and Bunsen noted the high sensitivity of a sodium flame test, and stated in Annalen der Physik und Chemie:^[37]

In a corner of our 60 m³ room farthest away from the apparatus, we exploded 3 mg. of sodium chlorate with milk sugar while observing the nonluminous flame before the slit. After a while, it glowed a bright yellow and showed a strong sodium line that disappeared only after 10 minutes. From the weight of the sodium salt and the volume of air in the room, we easily calculate that one part by weight of air could not contain more than 1/20 millionth weight of sodium.

Commercial production

Enjoying rather specialized applications, only about 100,000 tonnes of metallic sodium are produced annually.^[18] Metallic sodium was first produced commercially in 1855 by carbothermal reduction of sodium carbonate at 1100 °C,^{[citation needed]} in what is known as the Deville process:^[38]^[39]^[40]

Na₂CO₃ + 2 C → 2 Na + 3 CO

A related process based on the reduction of sodium hydroxide was developed in 1886.^[38]

Sodium is now produced commercially through the electrolysis of molten sodium chloride, based on a process patented in 1924.^[41]^[42] This is done in a Downs cell in which the NaCl is mixed with calcium chloride to lower the melting point below 700 °C. As calcium is less electropositive than sodium, no calcium will be deposited at the cathode. This method is less expensive than the previous Castner process of electrolyzing sodium hydroxide.

Reagent-grade sodium in tonne quantities sold for about US$3.30/kg in 2009; lower purity metal sells for considerably less.^{[citation needed]} The market for sodium is volatile due to the difficulty in its storage and shipping; it must be stored under a dry inert gas atmosphere or anhydrous mineral oil to prevent the formation of a surface layer of sodium oxide or sodium superoxide. These oxides can react violently in the presence of organic materials. Smaller quantities of sodium cost far more, in the range of US$165/kg; the high cost is partially due to the expense of shipping hazardous material.^[43]

Applications

Though metallic sodium has some important uses, the major applications of sodium use is in its many compounds; millions of tons of the chloride, hydroxide, and carbonate are produced annually.

Free element

Metallic sodium is mainly used for the production of sodium borohydride, sodium azide, indigo, and triphenylphosphine. Previous uses were for the making of tetraethyllead and titanium metal; because applications for these chemicals were discontinued, the production of sodium declined after 1970.^[18] Sodium is also used as an alloying metal, an anti-scaling agent,^[44] and as a reducing agent for metals when other materials are ineffective. Note the free element is not used as a scaling agent, ions in the water are exchanged for sodium ions. Sodium vapor lamps are often used for street lighting in cities and give colours ranging from yellow-orange to peach as the pressure increases.^[45] By itself or with potassium, sodium is a desiccant; it gives an intense blue colouration with benzophenone when the desiccate is dry.^[46] In organic synthesis, sodium is used in various reactions such as the Birch reduction, and the sodium fusion test is conducted to qualitatively analyse compounds.^[47] Lasers emitting light at the D line, utilising sodium, are used to create artificial laser guide stars that assist in the adaptive optics for land-based visible light telescopes.^{[citation needed]}

Heat transfer

NaK phase diagram, showing the melting point of sodium as a function of potassium concentration. NaK with 77% potassium is eutectic and has the lowest melting point of the NaK alloys at −12.6 °C.^[48]

Liquid sodium is used as a heat transfer fluid in some fast reactors,^[49] due to its high thermal conductivity and low neutron absorption cross section, which is required to achieve a high neutron flux; the high boiling point allows the reactor to operate at ambient pressure. Drawbacks of using sodium include its opacity, which hinders visual maintenance, and its explosive properties. Radioactive sodium-24 may be formed by neutron activation during operation, posing a slight radiation hazard; the radioactivity stops within a few days after removal from the reactor. If a reactor needs to be frequently shut down, NaK is used; due to it being liquid at room temperature, cooling pipes do not freeze. In this case, the pyrophoricity of potassium means extra precautions against leaks need to be taken. Another heat transfer application is in high-performance internal combustion engines with poppet valves, where valve stems partially filled with sodium are used as a heat pipe to cool the valves.

Biological role

In humans, sodium is an essential nutrient that regulates blood volume, blood pressure, osmotic equilibrium and pH; the minimum physiological requirement for sodium is 500 milligrams per day.^[50] Sodium chloride is the principal source of sodium in the diet, and is used as seasoning and preservative, such as for pickling and jerky; most of it comes from processed foods.^[51] The UL for sodium is 2.3 grams per day,^[52] the threshold which could lead to hypertension when exceeded,^[53] but on average people in the United States consume 3.4 grams per day.^[54] Hypertension causes 7.6 million premature deaths worldwide each year.^[55] (Note that salt contains about 39.3% sodium^[56]—the rest being chlorine and other trace chemicals; thus the UL of 2.3g sodium would be about 5.9g, or 2.7ml of salt—about half a US teaspoon^[57])

The renin-angiotensin system regulates the amount of fluids and sodium in the body. Reduction of blood pressure and sodium concentration in the kidney result in the production of renin, which in turn produces aldosterone and angiotensin, retaining sodium in the urine. Because of the increase in sodium concentration, the production of renin decreases, and the sodium concentration returns to normal.^[58] Sodium is also important in neuron function and osmoregulation between cells and the extracellular fluid, their distribution mediated in all animals by Na⁺/K⁺-ATPase;^[59] hence, sodium is the most prominent cation in extracellular fluid.^[60]

Unusually low or high sodium levels in humans are recognized in medicine as hyponatremia and hypernatremia. These conditions may be caused by genetic factors, physical factors associated with ageing or illnesses involving vomiting or diarrhea.^[61]

In C4 plants, sodium is a micronutrient that aids in metabolism, specifically in regeneration of phosphoenolpyruvate and synthesis of chlorophyll.^[62] In others, it substitutes for potassium in several roles, such as maintaining turgor pressure and aiding in the opening and closing of stomata.^[63] Excess sodium in the soil limits the uptake of water due to decreased water potential, which may result in wilting; similar concentrations in the cytoplasm can lead to enzyme inhibition, which in turn causes necrosis and chlorosis.^[64] To avoid these problems, plants developed mechanisms that limit sodium uptake by roots, store them in cell vacuoles, and control them over long distances;^[65] excess sodium may also be stored in old plant tissue, limiting the damage to new growth.

Precautions

Care is required in handling elemental sodium, as it generates flammable hydrogen and caustic sodium hydroxide upon contact with water; powdered sodium may spontaneously explode in the presence of an oxidizer.^{[citation needed]} Excess sodium can be safely removed by hydrolysis in a ventilated cabinet; this is typically done by sequential treatment with isopropanol, ethanol and water. Isopropanol reacts very slowly, generating the corresponding alkoxide and hydrogen.^[67] Fire extinguishers based on water accelerate sodium fires; those based on carbon dioxide and bromochlorodifluoromethane lose their effectiveness when they dissipate. An effective extinguishing agent is Met-L-X, which comprises approximately 5% Saran in sodium chloride together with flow agents; it is most commonly hand-applied with a scoop. Other materials include Lith+, which has graphite powder and an organophosphate flame retardant, and dry sand.

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^ Pohl, Hanna R.; Wheeler, John S.; Murray, H. Edward (2013). Astrid Sigel; Helmut Sigel; Roland K. O. Sigel, eds. Interrelations between Essential Metal Ions and Human Diseases. Metal Ions in Life Sciences 13. Springer. pp. 29–47. doi:10.1007/978-94-007-7500-8_2.
^ Kering, M. K. (2008). "Manganese Nutrition and Photosynthesis in NAD-malic enzyme C4 plants Ph.D. dissertation" (PDF). University of Missouri-Columbia. Retrieved 2011-11-09.
^ Subbarao, G. V.; Ito, O.; Berry, W. L.; Wheeler, R. M. (2003). "Sodium—A Functional Plant Nutrient". Critical Reviews in Plant Sciences 22 (5): 391–416. doi:10.1080/07352680390243495.
^ Zhu, J. K. (2001). "Plant salt tolerance". Trends in Plant Science 6 (2): 66–71. doi:10.1016/S1360-1385(00)01838-0. PMID 11173290.
^ "Plants and salt ion toxicity". Plant Biology. Retrieved 2010-11-02.
^ http://www.ehs.neu.edu/laboratory_safety/general_information/nfpa_hazard_rating/documents/NFPAratingSZ.htm
^ Angelici, R. J. (1999). Synthesis and Technique in Inorganic Chemistry. Mill Valley, CA: University Science Books. ISBN 0-935702-48-2.

External links

Sodium at The Periodic Table of Videos (University of Nottingham)
Etymology of "natrium" – source of symbol Na
The Wooden Periodic Table Table's Entry on Sodium
Sodium isotopes data from The Berkeley Laboratory Isotopes Project's

UpToDate Contents

全文を閲覧するには購読必要です。 To read the full text you will need to subscribe.

1. 塩分摂取量および塩分摂取量制限と原発性（本態性）高血圧 salt intake salt restriction and primary essential hypertension
2. 成人における健康食 healthy diet in adults
3. 成人における難治性浮腫の治療 treatment of refractory edema in adults
4. 小児における高ナトリウム血症 hypernatremia in children
5. カリウムと高血圧 potassium and hypertension

English Journal

Sodium excretion and associated factors in urine samples of African descendants in Alcântara, Brazil: a population based study.

Dos Santos EM1, Brito DJA2, Calado IL3, França AKT3, Lages JS4, Monteiro Junior FDC5, Dos Santos AM4, Salgado Filho N5.
Renal failure.Ren Fail.2018 Nov;40(1):22-29. doi: 10.1080/0886022X.2017.1419967.
PMID 29298567

Physicochemical properties, nutritional value and techno-functional properties of goldenberry (Physalis peruviana) waste powder concise title: Composition of goldenberry juice waste.

Mokhtar SM1, Swailam HM2, Embaby HE3.
Food chemistry.Food Chem.2018 May 15;248:1-7. doi: 10.1016/j.foodchem.2017.11.117. Epub 2017 Dec 2.
PMID 29329831

Dietary Supplementation with Virgin Coconut Oil Improves Lipid Profile and Hepatic Antioxidant Status and Has Potential Benefits on Cardiovascular Risk Indices in Normal Rats.

Famurewa AC1, Ekeleme-Egedigwe CA2, Nwali SC2, Agbo NN2, Obi JN2, Ezechukwu GC2.
Journal of dietary supplements.J Diet Suppl.2018 May 4;15(3):330-342. doi: 10.1080/19390211.2017.1346031. Epub 2017 Aug 17.
PMID 28816548

Japanese Journal

秤量法食事記録調査より求めた小学生，大学生，高齢者のミネラル摂取量及び食品群別寄与率の比較

今井具子,辻とみ子,山本初子,福渡努,柴田克己
栄養学雑誌 72(2), 51-66, 2014
【目的】写真併用食事記録調査より，ミネラルを中心とした栄養素等摂取状況を明らかにし，これらのミネラルの年齢群別，摂取量別食品群別寄与率を比較し，カルシウム・鉄を多く摂る食生活と栄養素等摂取状況の関連を検討すること。【方法】写真を併用した4日間の食事記録調査を小学生72人，大学生204人，高齢者55人に行い，日本食品標準成分表2010を用いて栄養素等摂取量，食品群別摂取量，各ミネラルの食品群別寄与率 …
NAID 130004553535

Effect of Dietary Fiber on the Level of Free Angiotensin II Receptor Blocker in Vitro

Iwazaki Ayano,Takahashi Kazuhiro,Tamezane Yui,Tanaka Kenta,Nakagawa Minami,Imai Kimie,Nakanishi Kunio
Biological and Pharmaceutical Bulletin 37(5), 779-784, 2014
… The interaction between angiotensin II type 1 (AT1) receptor blockers (ARBs), such as losartan potassium (LO), candesartan (CA), and telmisartan (TE), and dietary fiber was studied as to the level of free ARB in vitro. … When ARB was incubated with soluble (sodium alginate, pectin, and glucomannan) or insoluble (cellulose and chitosan) dietary fiber, the levels of free LO, TE, and CA decreased. …
NAID 130004147325

Estimation of Dietary Sodium Bicarbonate Dose Limit in Broiler under High Ambient Temperatures

Peng Yunzhi,Wang Yongwei,Ning Dong [他]
Journal of poultry science 50(4), 346-353, 2013-10
NAID 40019836710

Related Pictures

★リンクテーブル★

リンク元	「食事性ナトリウム」「食品中ナトリウム」「食物性ナトリウム」「食餌性ナトリウム」
拡張検索	「dietary sodium chloride」
関連記事	「dietary」

「食事性ナトリウム」

NFPA 704; "fire diamond"
	1 3 2 W
	The fire diamond hazard sign for sodium metal

Sodium, ₁₁Na
	Spectral lines of sodium
General properties
Name, symbol	sodium, Na
Appearance	silvery white metallic
Pronunciation	/ˈsoʊdiəm/; SOH-dee-əm
Sodium in the periodic table
	neon ← sodium → magnesium
Atomic number	11
Standard atomic weight (±) (Ar)	22.98976928(2)
Element category	alkali metal
Group, block	group 1 (alkali metals), s-block
Period	period 3
Electron configuration	[Ne] 3s1
per shell	2, 8, 1
Physical properties
Phase	solid
Melting point	370.944 K (97.794 °C, 208.029 °F)
Boiling point	1156.090 K (882.940 °C, 1621.292 °F)
Density near r.t.	0.968 g/cm3
when liquid, at m.p.	0.927 g/cm3
Critical point	2573 K, 35 MPa (extrapolated)
Heat of fusion	2.60 kJ/mol
Heat of vaporization	97.42 kJ/mol
Molar heat capacity	28.230 J/(mol·K)
Atomic properties
Oxidation states	+1, −1 (a strongly basic oxide)
Electronegativity	Pauling scale: 0.93
Ionization energies	1st: 495.8 kJ/mol; 2nd: 4562 kJ/mol; 3rd: 6910.3 kJ/mol; (more)
Atomic radius	empirical: 186 pm
Covalent radius	166±9 pm
Van der Waals radius	227 pm
Miscellanea
Crystal structure	body-centered cubic (bcc)
Speed of sound thin rod	3200 m/s (at 20 °C)
Thermal expansion	71 µm/(m·K) (at 25 °C)
Thermal conductivity	142 W/(m·K)
Electrical resistivity	47.7 nΩ·m (at 20 °C)
Magnetic ordering	paramagnetic
Young's modulus	10 GPa
Shear modulus	3.3 GPa
Bulk modulus	6.3 GPa
Mohs hardness	0.5
Brinell hardness	0.69 MPa
CAS Registry Number	7440-23-5
History
Discovery and first isolation	Humphry Davy (1807)
Most stable isotopes
	Main article: Isotopes of sodium
1.27453(2)	22Ne
1.27453(2)	22Ne
	* = excited state
	view; talk; edit; · references

　　[★]

英: dietary sodium
関: 食品中ナトリウム、食餌性ナトリウム、食物性ナトリウム

「食品中ナトリウム」

　　[★]

英: dietary sodium
関: 食事性ナトリウム、食餌性ナトリウム、食物性ナトリウム

「食物性ナトリウム」

　　[★]

英: dietary sodium
関: 食品中ナトリウム、食事性ナトリウム、食餌性ナトリウム

「食餌性ナトリウム」

　　[★]

英: dietary sodium
関: 食品中ナトリウム、食事性ナトリウム、食物性ナトリウム

「dietary sodium chloride」

　　[★]

食用塩化ナトリウム、食塩

関: sodium chloride、table salt

「dietary」

　　[★]

adj.

食事性の、食餌性の、食物性の、食事由来の、食物由来の

関: alimentary、foodborne

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[62] Kering, M. K. (2008). "Manganese Nutrition and Photosynthesis in NAD-malic enzyme C4 plants Ph.D. dissertation" (PDF). University of Missouri-Columbia. Retrieved 2011-11-09.

[63] Subbarao, G. V.; Ito, O.; Berry, W. L.; Wheeler, R. M. (2003). "Sodium—A Functional Plant Nutrient". Critical Reviews in Plant Sciences 22 (5): 391–416. doi:10.1080/07352680390243495.

[64] Zhu, J. K. (2001). "Plant salt tolerance". Trends in Plant Science 6 (2): 66–71. doi:10.1016/S1360-1385(00)01838-0. PMID 11173290.

[65] "Plants and salt ion toxicity". Plant Biology. Retrieved 2010-11-02.

[66] ttp://www.ehs.neu.edu/laboratory_safety/general_information/nfpa_hazard_rating/documents/NFPAratingSZ.htm

[67] Angelici, R. J. (1999). Synthesis and Technique in Inorganic Chemistry. Mill Valley, CA: University Science Books. ISBN 0-935702-48-2.

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dietary sodium