Question

The atomic numbers of two elements are given as Si-14, Ni-28. Write the subshell electronic configuration of these elements and also find out the group and period of each element.

Answer 1

The electronic configurations are
Si- $1s^{2}2s^{2}2p^{6}3s^{2}3p^2$
Ni- $1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}3d^{8}4s^2$

Period number of Silicon is 3 and Nickel is 4
Group number of Silicon is 14 and Nickel is 10