Properties of sodium atoms

Ionisation Energies and electron affinity

The electron affinity of sodium is 52.8  kJ mol-1. The ionisation energies of sodium are given below.

Ionisation energy number Enthalpy /kJ mol-1
1st 495.8
2nd 4562
3rd 6910.3
4th 9543
5th 13354
6th 16613
7th 20117
8th 25496
9th 28932
10th 141362
11th 159075

Ionisation energies of Na

Electronic configuration

The following represents the electronic configuration and its associated term symbol for the ground state neutral gaseous atom. The configuration associated with sodium in its compounds is not necessarily the same.

The bright yellow transition of Na at 589 nm, labelled "D" in the solar spectrum, is actually a pair of lines, that is, a "doublet".

Pointer to The Orbitron gallery of orbitals.

Kossel shell structure of Na
A schematic representation of the shell structure of sodium - not what the atom of sodium "looks like".

WebElements Shop

WebElements now has a WebElements shop at which you can buy periodic table posters, mugs, T-shirts, games, fridge magnets, molecular models, and more.

Periodic Table fridge magnets Periodic Table fridge magnets
Buy our periodic table fridge magnets here

WebElements poster Periodic table t-shirts Periodic table mouse mats Molymod molecular model kits Chemistry educational resources

sodium atomic number