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 non directional in nature, always overlap along the internuclear axis only. So s-orbitals form `sigma`- bonds only. The `sigma`- bonds in (i) and (ii) are denoted as `sigma_(s-s)` and `sigma_(s-p)` respectively.