What is the electron configuration of Sr2+?

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Answer 1 · 2015-10-17T16:58:14

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

Strontium is atomic number 38 so its electron configuration 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)#

#[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]#