Fill in the blanks i

(i) Two atoms of the same element combine to form a molecule. The bond between them is known as covalent bond.

(ii) Two chlorine atoms combine to form a molecule. The bond between them is known as covalent.

(iii) In forming oxygen molecule, two electrons are shared by each atom of oxygen.

(iv) In forming N₂ molecule, three electrons are shared by each atom of nitrogen.

(vi) The number of single covalent bonds in C₂H₂ molecule are two.

(vi) Melting points and boiling points of ionic compounds are generally higher than those of covalent compounds.