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Answer :
The number of atoms present are:
(i) H\( _2 \)S molecule has 2 atoms of hydrogen and 1 atom of sulphur hence H\( _2 \)S molecule a total of 3 atoms.
(ii) PO\( _4 \)\(^{3-} \) ion has 1 atom of phosphorus and 4 atoms of oxygen hence PO\( _4 \)\(^{3-} \) ion has a total of 5 atoms.