Question

The electronic configuration of an element ${}^{\prime }{X}^{\prime }$ is $2,8,6$. To which group and period of the modern periodic table does ${}^{\prime }{X}^{\prime }$ belong. State its valency and justify your answer in each case.

Answer 1

Element 'X' is sulphur(2,8,6)

Thus, it's atomic number will be $=2+8+6=16$

Thus the element is $Si$

It belongs to p-block of periodic table.

Its electronic configuration can also be written as $\left[Ne\right]3s^{2}3p^4$

Thus it belongs to $3^{rd}$ period

Group number $=16$

Its valency will be $8-6=2$