Fill in the blanks in the following sentences :
(i). Two atoms of the same element combine to form a molecule. The bond between them is known as ____ bond
(ii). Two chlorine atoms combine to form a molecule. The bond between them is known as _____
(iii). In forming oxygen molecule _____ electrons are shared by each atom of oxygen.
(iv). In forming `N_(2)` molecule _____ electrons are shared by each atom of nitrogen.
(v). The number of single covalent bonds in `C_(2)H_(2)` molecule are ______
(vi). Melting points and boiling points of ionic compounds are generally ______ than those of covalent compounds.

Explanation

(i) covalent
(ii) covalent
(iii) two
(iv) three
(v) two
(vi) higher
(a) (i) Covalent bonds
(i) Ionic bonds
(b) covalent bond.