Question

Differentiating electron in $K\left(19\right)$ goes into ns and this is s-block element. If Aufbau rule is not followed,$K\left(19\right)$ will be placed in:

• A. s-block
• B. p-block
• C. d-block
• D. f-block

Answer 1

The correct option is C d-block

$K\left(19\right)$ in the absence of Aufbau rule will have EC as: $1s^2$, $2s^{2}2p^6$, $3s^{2}3p^{6}3d^1$ and thus differentiating electron enters into $3d$ d-block element.