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Sodium (Na)

From Wikipedia, the free encyclopediaSodium /ˈsoʊdiəm/ is a chemical element with symbol Na (from Ancient Greek Νάτριο) 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.

Sodium in the periodic table

Atomic number11
Element categoryAlkali Metal

Physical properties

Phase at STPSolid
Density0.968 g/cm3
Atomic weight22.9898 u
Melting point370.944 K
97.794 °C
208.0292 °F
Boiling point1156.09 K
882.94 °C
1621.292 °F

Atomic properties

Electronegativity (Pauling Scale)0.93
Electron affinity52.867 kJ/mol
Oxidation states−1, +1
(a strongly basic oxide)
Ionization energies
1495.8 kJ/mol
2 4562 kJ/mol
3 6910.3 kJ/mol
4 9543 kJ/mol
5 13354 kJ/mol
6 16613 kJ/mol
7 20117 kJ/mol
8 25496 kJ/mol
9 28932 kJ/mol
10 141362 kJ/mol
11 159076 kJ/mol

Electron configuration

Elektronkonfiguration (shorthand)[Ne] 3s1
Electron configuration1s2 2s2 2p6 3s1
Electrons per shell2, 8, 1


Discovered byHumphry Davy
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