Chlorine is an element of atomic number $17$. It is a mixture of isotopes having mass numbers of $35$ and $37$.

Complete the given table:

Element	Number of electrons	Number of protons	Number of neutrons
${}_{17}{}^{35}\mathrm{Cl}$	___	___	___
${}_{17}{}^{37}\mathrm{Cl}$	___	___	___

 

Five atoms are labelled A to E.

(a) Which of these above mentioned atoms,

(i) contains $7$ protons?
(ii) has an electronic configuration $2,7$?

(b) Write down the formula of the compound formed by atoms $\mathrm{C}$ and $\mathrm{D}$.

Elements $\mathrm{A}, \mathrm{B}$ and $\mathrm{C}$ have atomic numbers $9,20$, and $10$ respectively.

State which one is (i) a non-metal; (ii) a metal and (iii) chemically inert.