Question

(i) Define atomicity

(ii) Give an example each of a polyatomic element and a polyatomic ion.

(iii) How many atoms are present in CaCl2 molecule and

SO24ion?

(iv) Write down the formulae of

(a) sodium carbonate

(b) Ammonium chloride

(c) Zinc oxide

(d) Aluminium hydroxide

Answer 1

iv (a) NaCo3
(b) NH4Cl
(C) ZnO
(D) Al3OH

Answer 2

Answer:Atomicity is the number of atoms of an element present in one molecule of that element. For example, there are 2 atoms of hydrogen present in H2 molecule. So its atomicity is 2. 2) Sulphur, phosphorus are polyatomic elements while carbonate (CO.

Explanation: