Chapter 3

NCERT
Class 9
Science
Solutions
4. How many atoms are present in a

Question:

How many atoms are present in a (a) H2S molecule and (b) PO43– ion ?

Answer:

(a) H2S molecule consists of 2 hydrogen atoms and one sulphate atom.

∴ 3 atoms are present in H2S.

(b) PO43- ion consists of one atom of phosphorus and four atoms of oxygen.

∴ Five atoms are present in PO43-

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