Element Sodium

Sodium ElementSodium atom is an alkali metal atom. It has a role as a Saccharomyces cerevisiae metabolite.
A member of the alkali group of metals. It has the atomic symbol Na, atomic number 11, and atomic weight 23.
It is a soft, silvery-white, highly reactive metal. Because it has a single electron in its outer shell, which it readily donates, creating a positively charged ion—the Na+ cation.
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, and thus sodium and chlorine are the most common dissolved elements by weight in the oceans.
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 ECF compartment volume.

Names and Identifiers

Chemical Formula:Na
CAS:7440-23-5
Molecular Weight:22.990g/mol
EC Number :n/a
MDL Number:MFCD00085307
Color:silvery white
Other Names:n/a
PubChem CID:5360545
IUPAC Name:Sodium
Inchl:InChI=1S/Na
InChI Key:KEAYESYHFKHZAL-UHFFFAOYSA-N
Canonical SMILES:[Na]
ICSC Number:0717

Physical & Chemical Properties

Phase:Solid
Density:0.968 g/cm³
Boiling Point:1156.090 K ​(882.940 °C, ​1621.292 °F)
Melting Point:370.944 K ​(97.794 °C, ​208.029 °F)
Molecular Formula:Na
Flash Point:128 °F
Exact Mass:22.989771
Symbol:Globally Harmonized System of ClassificationGlobally Harmonized System of Classification
Signal Word:Danger
Hazard Statements:H260-H314
Precautionary Statements:P223-P231 + P232-P280-P305 + P351 + P338-P370 + P378-P422
Hazard Codes:C:Corrosive
Risk Phrases:R14/15;R34
Safety Phrases:S26-S8-S6A-S45-S43D-S43-S5*-S53
RIDADR:UN 3264 8/PG 3
WGK Germany:1
RTECS:VY0686000
Packaging Group:I
Hazard Class:4.3

There are 21 recognized isotopes of sodium (11Na), ranging from 18 Na to 39 Na and two isomers (22mNa and 24mNa). 23Na is the only stable (and the only primordial) isotope.
It is considered a monoisotopic element and it has a standard atomic weight of 22.98976928(2). Sodium has two radioactive cosmogenic isotopes (22Na,half-life = 2.605 years; and 22Na, half-life ≈ 15 hours).
With the exception of those two, all other isotopes have half-lives under a minute, most under a second. The shortest-lived is 18Na, with a half-life of 1.3(4)×10−21 seconds.

Naturally occurring isotopes

IsotopeMass/DaNatural abundance (atom %)Nuclear spin (I)Magnetic moment (μ/μN)
23Na22.9897677 (10)1003/22.217520

Radiosotope data

IsotopeMass/DaHalf-lifeMode of decayNuclear spinNuclear magnetic moment
21Na20.99765522.48 sEC to 21Ne3/2
22Na21.9944372.605 yEC to 22Ne31.746
24Na23.990963314.96 hβ to 24Mg41.690
25Na24.98995459.3 sβ to 25Mg5/23.683
26Na25.992591.07 sβ to 26Mg32.851

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