Question

Which of the following represents the electronic configuration of a transition element

• A. $1s^2,2s^2{p}^6......n{s}^2{p}^3$
• B. $1s^2,2s^2{p}^6......n{s}^2{p}^3,(n+1)s^2$
• C. $1s^2,2s^2{p}^6......n{s}^2{p}^6{d}^{10},(n+1)s^2{p}^1$
• D. $1s^2,2s^2{p}^6......n{s}^2{p}^6$

Answer 1

The correct option is B $1s^2,2s^2{p}^6......n{s}^2{p}^3,(n+1)s^2$

$1s^2,2s^2{p}^6......n{s}^2{p}^6{d}^3,(n+1)s^2$ as last electron enters d-subshell.