Question:medium
The numbers of protons, electrons and neutrons in a molecule of heavy water are respectively :
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
Molecular mass of \(\mathrm{D_2O} = 2(2) + 16 = 20\).
Total electrons = total protons = sum of atomic numbers = 2(1) + 8 = 10 (neutral molecule).
Neutrons = mass number - protons = 20 - 10 = 10.
So (protons, electrons, neutrons) = (10, 10, 10).
Answer: (2) 10, 10, 10
Total electrons = total protons = sum of atomic numbers = 2(1) + 8 = 10 (neutral molecule).
Neutrons = mass number - protons = 20 - 10 = 10.
So (protons, electrons, neutrons) = (10, 10, 10).
Answer: (2) 10, 10, 10
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