Question

how many atoms are present in a H2S molecule and po43-

Answer 1

(i) 3 atoms because H2S molecule has two atoms of hydrogen and one atom of sulphur.

(ii) 5 atoms because PO43-   ion has one atom of phosphorus and four atoms of oxygen.

Answer 2

1) 2 atoms of hydrogen + 1 atom of sulphur
= three (3) atoms in H2s molecule

2) 1 atom of phosphorus + 4 atoms of oxygen
= five (5) atoms in PO43- ion.