Questions
The correct order of atomic radii in group 13 elements is
detailed solution
Correct option is D
The atomic radii as well as ionic radii increases on moving down the group 13 elements because of the successive addition of one extra shell of electrons. However, there is an anomaly in case of atomic radius . Atomic radius Ga is lesser as compared to that of Al. Gallium (Ga) with electronic configuration, [Ar]18 3d10 4s2 4p1 has extra d-electrons which do not screen the nucleus effectively. Consequently, electrons of Ga are more attracted by nucleus. Thus, the increasing order of atomic radii of the group 13 elements is B(85pm) < Ga (135pm) < Al (143pm) < In (167pm) < Tl (170pm).Similar Questions
The bond dissociation energy of BF bond in BF3 is 646 kJ mol–1 whereas that of CF in CF4 is 315 kJ mol–1. The correct reason for higher BF bond dissociation energy as compared to that of CF bond is :
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