What kind of a bond is formed when the orbitals of two atoms A and B undergo (i) s-s overlap (ii) s-p overlap?

Explanation

In both (i) and (ii), only `sigma `-bonds are formed. Because s-orbitals are nondirectional in nature, always overlap along the internuclear axis only. So s-orbitals form o-bonds only. The `alpha` -bonds in (i) and (ii) are denoted as `sigma _(s-s)` and `sigma_(s-p)` respectively