Q.
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a
Sets of atomic numbers 8, 16, 34, 52 corresponds to elements of group 16.
b
Amongst Cr+3, Cr and Cu⊕, Cr has maximum number of electrons in 'dxy' orbital.
c
EN and IE both increases down the group in the periodic table.
d
Element 'X' with electronic configuration, [Xe]4f145d1 6s2 belongs to 6th period and 2nd, group.
answer is B.
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