Atoms may be regarded as comprising of protons , neutrons and electrons. If the mass attributed to a neutron be halved and electron were doubled , calculate the mass of 12 C 6
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be reduced approximately by 25%
Mass of a atom =mass of proton+mass ofneutron
As mass of electron is very less compare to neutron and proton.
So if mass of neutron is halved then total mass of
12
C=6p+
2
6n
=9
∴ % decrease in mass of atom =
12
3
×100=25 %
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