Neon Magnesium

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

Symbol

Atomic number

Group

Period

Block

Element category

Alkali Metal

Physical properties

Phase at STP

Solid

Density

0.968 g/cm³

Atomic weight

22.9898 u

Melting point

370.944 K
97.794 °C
208.0292 °F

Boiling point

1156.09 K
882.94 °C
1621.292 °F

Atomic properties

Electronegativity (Pauling Scale)

0.93

Electron affinity

52.867 kJ/mol

Oxidation states

−1, +1
(a strongly basic oxide)

Ionization energies

1	495.8 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 configuration

1s² 2s² 2p⁶ 3s¹

Electrons per shell

2, 8, 1

History

Discovered

1807

Discovered by

Humphry Davy