Question

Match the elements of the List II to their respective block in the List I.

Answer 1

Sodium (Na) - $1s^{2}2s^{2}2p^{6}3s^1$ Last electron is entering into s orbital this is s block element.
Chromium(Cr) - $1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}4s^{2}3d^5$ Last electron is entering d orbital it is d block element.
Cerium (Ce) - $\left[Xe\right]4f^{1}5d^{1}6s^2$ This is because of inert pair effect but considered as f block element.
Silicon(Si) -$1s^{2}2s^{2}2p^{6}3s^{2}3p^2$ Last electron is entering p orbital it is a p block element.
Hence A to 2; B to 4; C to 1; D to 3.