Question 4 Page 39 - Chapter 3 Class 9 - Atoms And Molecules

How many atoms are present in a

(i) H ₂ S molecule and

(ii) PO 4 3– ion

Answer

(i) H 2 S molecule

Number of atoms = (2 x Hydrogen) + (1 x Sulphate)

                             = 3 atoms

(ii) PO ₄ ^3– ion

Number of atoms = (1 x Phosphorus + 4 x Oxygen)

                             = 5 atoms