Ionization Energy (IE)

Mg (g) + 735 kJ ? Mg+ (g) + e- [Ne]2s1

Mg (g) atom [Ne]2s

Mg

• Energy ‘cost’ is very high to remove an INNER SHELL e- (shell of n < nVALENCE).

• This is why oxidation. no. = Group no.

Mg2+ (g) + 7733 kJ ? Mg3+ (g) + e- [He]2s22p5

Mg+ (g) + 1451 kJ ? Mg2+ (g) + e- [Ne]2s0

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