A) Lanthanoid contraction
B) Greater screening effect
C) Inert pair effect
D) None of these
Correct Answer: B
Solution :
The atomic radius of \[Ga\] is slightly less than that of \[Al\] because in going from \[Al\] to \[Ga,\] the electrons have already occupied 3d sub shell in \[Ga,\] The screening effect of these intervening electrons being poor and has less influence to decrease the effective nuclear charge, therefore the electrons in \[Ga\] experiencess more forces of attraction towards nucleus to result in lower size of \[Ga\] than \[Al\].You need to login to perform this action.
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