Question:

The numbers of protons, electrons and neutrons in a molecule of heavy water are respectively :

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Heavy water is \(\mathrm{D_2O}\); count the particles in deuterium (\(^2_1\mathrm{H}\)) and oxygen (\(^{16}_8\mathrm{O}\)).
Updated On: Oct 31, 2026
  • 8, 10, 11
  • 10, 10, 10
  • 10, 11, 10
  • 11, 10, 10
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The Correct Option is B

Solution and Explanation

Heavy water = \(\mathrm{D_2O}\), where D = \(^2_1\mathrm{H}\) has 1 proton, 1 electron, 1 neutron; \(^{16}_8\mathrm{O}\) has 8 protons, 8 electrons, 8 neutrons.
Protons = 2(1) + 8 = 10.
Electrons = 2(1) + 8 = 10 (neutral molecule).
Neutrons = 2(1) + 8 = 10.
So the numbers are 10, 10, 10.
Answer: (2) 10, 10, 10
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