Draw orbit structure diagram of calcium oxide $\left(\mathrm{CaO}\right)$.

[Atomic numbers $\mathrm{Ca}=20, \mathrm{O}=8$]

Compare :

sodium atom and sodium ion

Compare:

chlorine atom and chloride ion, with respect to atomic structure.

Compare chlorine atom and chloride ion, with respect to their electrical state.

Potassium (At. No. $19$) and chlorine (At. No. $17$) form a compound. Explain the formation of the compound on the basis of :

Oxidation.

Potassium (At. No. $19$) and chlorine (At. No. $17$) form a compound. Explain the formation of the compound on the basis of reduction.