question_answer 1)

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.

Answer:

(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).