Q.
First ionisation potential of magnesium is greater than that of aluminium because
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a
Aluminium atom is very large when compared to Magnesium atom
b
Aluminium has a stable electronic configuration
c
Magnesium has a stable electronic configuration
d
The electron affinity of Magnesium is positive (energy is absorbed)
answer is C.
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Detailed Solution
Mg(Z=12)...[Ne]3s2Al(Z=13)...[Ne]3s23p1"Mg" has completely filled 3s orbital (symmetrical configuration) leading to stability
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