Properties of calcium atoms

Ionisation Energies and electron affinity

The electron affinity of calcium is 2.37  kJ mol-1. The ionisation energies of calcium are given below.

Ionisation energy number Enthalpy /kJ mol-1
1st 589.8
2nd 1145.4
3rd 4912.4
4th 6491
5th 8153
6th 10496
7th 12270
8th 14206
9th 18191
10th 20385
11th 57110
12th 63410
13th 70110
14th 78890
15th 86310
16th 94000
17th 104900
18th 111710
19th 494850
20th 527760

Ionisation energies of Ca

Electronic configuration

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

Pointer to The Orbitron gallery of orbitals.

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

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calcium atomic number