Question

An atom consist of electrons, protons, and neutrons. If the mass attributed to neutron was halved and that attributed to the electron was doubled, the atomic mass would be approximately:
(a) Same
(b) Doubled
(c) Halved
(d) Reduced by 25%
Give answer briefly describe.

Answer 1

if the mass of electron is considered negligible as usual,
the mass of the atom will be reduced by 25% as the mass of an atom is sum of protons and neutrons ..
the no.of protons will be same ..

Ans- D