Which is the electronic configuration that describes Mg²⁺?

Question

Quizplus · Accepted Answer

- Mg has electronic configuration of 1s2 2s2 2p6 3s2
- S1U1P12+ has electronic configuration of 1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 5s1 4d1
- S1S1P0 has electronic configuration of 1s2 2s2 2p6 3s2 3p6
- The electronic configuration for MgS1U1P12+S1S1P0 would be 1s2 2s2 2p6 3s2 3p6 (for S1U1P12+) and 1s2 2s2 2p6 3s2 3p6 (for S1S1P0), but we also have to include the electrons from the magnesium ion. Therefore, the complete electronic configuration would be: 
1s2 2s2 2p6 3s2 3p6 (S1U1P12+) + 1s2 2s2 2p6 3s2 3p6 (S1S1P0) + 2s2 2p6 (Mg2+) 
= 1s2 2s2 2p6 3s2 3p6 (S1U1P12+) + 1s2 2s2 2p6 3s2 3p6 (S1S1P0) + 2s2 2p6 (Mg)
= 1s2 2s2 2p6 3s2 3p6 (S1U1P12+, S1S1P0) + 2s2 2p6 (Mg) + 2p6 (S1U1P16)

Which Is the Electronic Configuration That Describes Mg2+

Which Is the Electronic Configuration That Describes Mg²⁺