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The numbers of protons, electrons and neutrons in a molecule of heavy water are respectively :
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The correct answer is:
$10,10,10$
$10,10,10$
Heavy water is $\mathrm{D}_2 \mathrm{O}$ hence
number of electrons $=2+8=10$
number of protons $=10$
Atomic mass of $\mathrm{D}_2 \mathrm{O}=4+16=20$
hence number of neutron
$=$ Atomic mass $-$ number of protons
$$
=20-10=10
$$
number of electrons $=2+8=10$
number of protons $=10$
Atomic mass of $\mathrm{D}_2 \mathrm{O}=4+16=20$
hence number of neutron
$=$ Atomic mass $-$ number of protons
$$
=20-10=10
$$
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