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1) A ) The number of atoms present are as follows:(i) H2S cule has 2 atoms of hydrogen and 1 atom of sulphur hence 3 atoms in totality. (ii) PO43- ion has 1 atom of phosphorus and 4 atoms of oxygen hence 5 atoms in totality.
2) A) The chemical formula of calcium oxide is CaO. The molecule is formed by the calcium cation Ca
+2
and the oxygen anion O
−2
, which form an ionic bond.
3) A) .
(b) Very poor, good.
(c) Better
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1A.The structure of Hydrogen sulfide is similar to that of water. In an H2S molecule, three atoms are present in total. Amongst the three, two are hydrogen and one of sulphur.
2A.The molecule is formed by the calcium cation Ca
+2
and the oxygen anion O
−2
, which form an ionic bond.
3A.(b) Very poor, good.
(c) Better
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