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

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

JEE MainJEE Main 2013Hydrogen

Solution:

Heavy water is $D_2O$ hence
number of electrons $= 2 + 8 = 10$
number of protons $=10$
Atomic mass of $D_2O = 4+16 = 20$
hence number of neutron
= Atomic mass - number of protons
$= 20 -10 = 1 0$