Q.
An element with Z = 49 belongs to ………….group and …………….period of the Modern periodic table
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a
3rd, 5th
b
13th, 4th
c
13th, 5th
d
15th, 4th
answer is C.
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Detailed Solution
Z=49; the atomic numbers of preceding elements of the group are 49-18=31; 31-18=13; 13-8=5; Thus 49th element belongs to Boron family; GEC is ns2np1; Boron-2s22p1(outermost configuration); thus B-2nd, Al-3rd, Ga-4th, In-5th ....period number ; Number of valence electrons=3, p block ; 'In" belongs to 13th gp, 5th period
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