Question

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

• A. $4^{th},{12}^{th}$
• B. $4^{th},{11}^{th}$
• C. $5^{th},{12}^{th}$
• D. $5^{th},{11}^{th}$

Answer 1

The correct option is D $5^{th},{11}^{th}$

Atomic no.=Z=$47$

elctronic configuration=$1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}4s^2$

$3d^{10}4p^{6}5s^{2}4d^9$

The period is the no. of principal quantum

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

Group no. is the no. of $e^{-}s$ in the penultimate shell & valence shell=$9+2=11$

Hence, the correct option is $D$