Define :

(a) a chemical bond,

(b) an electrovalent bond,

(c) a covalent bond.

What are the conditions for the formation of an electrovalent bond ?

An atom X has three electrons more than the noble gas configuration. What type of ion will it form ? Write the formula of its (i) sulphate (ii) nitrate (iii) phosphate (iv) carbonate (v) hydroxide.

Mention the basic tendency of an atom which makes it to combine with other atoms.