Question

What is the electron configuration of iron 2+?

Answer 1

Of `Fe^(2+)`, `Z=26...........`

Explanation:

We follow the `"aufbau principle"`.........

`1s^(2)2s^(2)2p^(6)3s^(2)3p^(6)4s^(2)3d^(6)` for atomic iron.....26 electrons specified as required.....

And for `"ferrous ion"`..............24 electrons specified as required.....why `"as required?"`

`{1s^(2)2s^(2)2p^(6)3s^(2)3p^(6)3d^(6)}^(2+)`