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First ionisation potential of magnesium is greater than that of aluminium because

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Aluminium atom is very large when compared to Mg

Aluminium has a stable electronic configuration

Magnesium has a stable electronic configuration

The electron affinity of Magnesium is positive (energy is absorbed)

answer is C.

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Detailed Solution

Electronic configuration of Mg = 1s²2s²2p⁶3s² (stable completely filled configuration)

Electronic configuration of Al = 1s²2s²2p⁶3s² 3p¹ (normal configuration)

It is very difficult to remove the electron from stable completely filled configuration.

Hence, First ionisation potential of magnesium is greater than that of aluminium

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