EXERCISE 4(C)

Write down the electronic configuration of chlorine atom?

Write down the electronic configuration of the chloride ion?

Rutherford's $\mathrm{\alpha }$-particle scattering experiment led to the discovery of?

Number of valence electron's in ${\mathrm{O}}^{2-}$is:

Which of the following is the correct electronic configuration of potassium?

The mass number of an atom whose unipositive ion has $10$ electrons and $12$ neutrons are:

Explain
Octet rule for formation of a chemical compound.

Explain:

Duplet rule for formation of Hydrogen.