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QUESTION

# What is the electron configuration of Sr2+?

1s^(2)2s^(2)2p^(6)3s^(2)3p^(6)3d^(10)4s^(2)4p^(6)

Strontium is 38 so its can be written:

2.8.18.8.2

In orbital notation this is:

1s^(2)2s^(2)2p^(6)3s^(2)3p^(6)3d^(10)4s^(2)4p^(6)5s^(2)

The notation is:

[Kr]5s^(2)

When strontium forms a 2+ ion the 2 outer 5s electrons are lost so Sr^(2+) can be written as:

1s^(2)2s^(2)2p^(6)3s^(2)3p^(6)3d^(10)4s^(2)4p^(6)

Or:

[Kr]