• question_answer 40) Assign the position of the element having outer electronic configuration (i) $n{{s}^{2}}n{{p}^{4}}$ for $n=3$ (ii) $(n-1){{d}^{2}}n{{s}^{2}}$ for $n=4$ and (iii) $(n-2){{f}^{7}}(n-1){{d}^{1}}n{{s}^{2}}$ for $n=6,$ in the periodic table.

(i) The electronic configuration of the element is $3{{s}^{2}},3{{p}^{4}}$. Thus, the element belongs to 3rd period and group 16. (ii) The electronic configuration of the element is$3{{d}^{2}}4{{s}^{2}}$. Thus, the element belongs 4th period and group 4. (iii) The electronic configuration of the element is$4{{f}^{7}}5{{d}^{1}}6{{s}^{2}}$. Thus, the element belongs to 6th period, group 3 (Lanthanide).