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Question

The first ionisation potential of Na, Mg and Si are 496, 737, and 776 kJ mol1 respectively. The ionisation potential of Al could be:

A
760 kJ mol1
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B
575 kJ mol1
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C
801 kJ mol1
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D
419 kJ mol1
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Solution

The correct option is B 575 kJ mol1
Ionisation potential increases when we move from left to right in a period. But the ionisation enthalpy of Al is lower than that of Mg as the 3p1 electron of Al is easier to remove than to remove an electron from a fully-filled 3s-orbital of Mg.

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