How many atoms a
Question.
How many atoms are present in a
(i) $\mathrm{H}_{2} \mathrm{~S}$ molecule and
(ii) $\mathrm{PO}_{4}^{3}$ ion?

Solution:
(i) In a $\mathrm{H}_{2} \mathrm{~S}$ molecule, three atoms are present; two of hydrogen and one of sulphur.
(ii) In a $\mathrm{PO}_{4}^{3-}$ ion, five atoms are present; one of phosphorus and four of oxygen
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