Two or more atoms of the same or different elements chemically combine to form a
(i) molecule of an element
(ii) molecule of a covalent compound
(iii) polyatomic ion
(iv) network solid

Options

A. (i), (ii)
B. (i), (ii), (iii)
C. (i), (ii), (iv)
D. (i), (ii), (iii), (iv)

Answer

D

Explanation

Two atoms of oxygen combine to form a molecule of oxygen `(O_2)`, two atoms of hydrogen and one atom of oxygen combine together to form a molecule of water `(H_2O)`, one C atom combines with one N atom to form cyanide ion `(CN^(-))`, and a number of Si and O atoms combine to form a network solid (silica, `SiO_2`).