Classification Of Elements And Periodicity In Properties Ques 2
2. The correct order of atomic radii in group 13 elements is
[2018]
(a) B $<Al<$ In $<Ga<Tl$
(b) $B<Al<Ga<$ In $<$ Tl
(c) B $<Ga<Al<$ In $<Tl$
(d) B $<$ Ga $<Al<Tl<$ In
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Answer:
Correct Answer: 2.(c)
Solution:
(c) Due to poor shielding effect of $3 d$ electrons in $Ga$, the atomic radii of $Ga<Al$. Thus, the correct order of atomic radii is $B<$ $Ga<A l<I n<T l$.
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