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Chemistry Question on d -and f -Block Elements

General electronic configuration of lanthanides are

A

(n−2)f1−14(n−1)s2p6d0−1 ns2(n-2)f^{1-14}(n-1)s^2p^6d^{0-1}\,ns^2

B

(n−2)f10−14(n−1)d0−1 ns2(n-2)f^{10-14}(n-1)d^{0-1}\,ns^2

C

(n−2)f0−14(n−1)d10 ns2(n-2)f^{0-14}(n-1)d^{10}\,ns^2

D

(n−2)d0−1(n−1)f1−14 ns2(n-2)d^{0-1}(n-1)f^{1-14}\,ns^2

Answer

(n−2)f1−14(n−1)s2p6d0−1 ns2(n-2)f^{1-14}(n-1)s^2p^6d^{0-1}\,ns^2

Explanation

Solution

In lanthanides (at. no. of elements 58 to 71) the electronic configuration of outermost shells are (n−2)f1−14(n−1)s2p6d0 to 1ns2.(n-2)f^{1-14}(n-1)s^2p^6d^{0 \, to \, 1}ns^2.