JEE MAIN - Chemistry (2020 - 8th January Morning Slot - No. 12)
The first ionization energy (in kJ/mol) of Na, Mg, Al and Si respectively, are :
496, 577, 786, 737
496, 737, 577, 786
786, 737, 577, 496
496, 577, 737, 786
Explanation
Elecronic configuration of Na = [Ne] 3s1
Mg = [Ne] 3s2
Al = [Ne] 3s23p1
Si = [Ne] 3s23p2
Correct order is :
Na $$<$$ Al $$<$$ Mg $$<$$ Si
Mg = [Ne] 3s2
Al = [Ne] 3s23p1
Si = [Ne] 3s23p2
Correct order is :
Na $$<$$ Al $$<$$ Mg $$<$$ Si
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