Atoms may be regarded as comprising of protons, neutrons and electrons. If the mass attributed to a neutron were halved and that attributed to the electron were doubled, the atomic mass of $_{6}^{12} C$ would:

remain approximately the same

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be approximately doubled

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be approximately halved

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be reduced approximately by 25%

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Solution

The correct option is D be reduced approximately by 25%
Mass of a atom $= m a s s o f p r o t o n + m a s s o f n e u t r o n$
As mass of electron is very less compare to neutron and proton.
So if mass of neutron is halved then total mass of $^{12} C = 6 p + \frac{6 n}{2} = 9$
$∴$ % decrease in mass of atom $= \frac{3}{12} \times 100 = 25$ %

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Atoms may be regarded as comprising of protons, neutrons and electrons. If the mass attributed to a neutron were halved and that attributed to the electron were doubled, the atomic mass of 126C would:

The correct option is D be reduced approximately by 25%Mass of a atom =mass of proton+mass ofneutronAs mass of electron is very less compare to neutron and proton.So if mass of neutron is halved then total mass of 12C=6p+6n2=9∴ % decrease in mass of atom =312×100=25 %

Atoms may be regarded as comprising of protons, neutrons and electrons. If the mass attributed to a neutron were halved and that attributed to the electron were doubled, the atomic mass of $_{6}^{12} C$ would: