Calculation no.

Magnesium (Mg²⁺) (1s²-core)

Sulfur (S^2-)

(1s²2s²2p²-core)

No. of valence functions

Energy Gap (eV)

I

2s²2p⁶3p⁰

3s²3p⁶

22

6.590 (Γ-L)

II

2s²2p⁶3p⁰

3s²3p⁶4p⁰

28

6.475 (Γ-L)

III

2s²2p⁶3p⁰3s⁰

3s²3p⁶4p⁰

30

3.278 (Γ-X)

IV

2s²2p⁶3p⁰3s⁰

3s²3p⁶4p⁰4s⁰

32

3.337 (Γ-X)

V

2s²2p⁶3p⁰3s⁰4p⁰

3s²3p⁶4p⁰4s⁰

38

3.370 (Γ-X)

VI

2s²2p⁶3p⁰3s⁰4p⁰4s⁰

3s²3p⁶4p⁰4s⁰

40

3.19 (Γ-X)