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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