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Question

Element with atomic number 47 belongs to the period ________ and the group _______.

A
4th,12th
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B
4th,11th
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C
5th,12th
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D
5th,11th
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Solution

The correct option is D 5th,11th
Atomic no.=Z=47
elctronic configuration=1s22s22p63s23p64s2
3d104p65s24d9

The period is the no. of principal quantum

No. of valence shell, i.e., 5

Group no. is the no. of es in the penultimate shell & valence shell=9+2=11

Hence, the correct option is D

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