Question 4:

How many atoms are present in a

(i) H₂S molecule and

(ii) PO₄³⁻ ion?

Answer:

(i) In an H₂S molecule, three atoms are present; two of hydrogen and one of sulphur.

(ii) In a PO₄³⁻ ion, five atoms are present; one of phosphorus and four of oxygen.

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