MEDIUMMCQ SINGLEIChO (Chemistry Olympiad)Inorganic Chemistryp-Block (group 13 and 14)Previous Year Questions
The correct order of atomic radii in group 13 elements is (NEET 2018)
A.B < Al <Ga< In <Tl
B.B <Ga< Al <Tl< In
C.B < Al < In <Ga<Tl
D.B <Ga< Al < In <Tl✓ Correct
Explanation
According, to general trend of atomic size, atomic size increases down the group as electrons are added to new shells and effective nuclear charge decreases. But in group 13, Ga due to its poor shielding effect its effective nuclear charge is little greater than Al. Thus the trend of atomic size follows the order: B < Ga < Al < In < Tl Hence, the correct option is (d).
Practice More Like This
Take chapter-wise tests, track your progress, and master p-Block (group 13 and 14).
Start Free Practice →