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Q. Atoms consists of protons, neutrons and electrons. If the mass of neutrons and electrons were made half and two times respectively to their actual masses, then the atomic mass of $_{6}C^{12}$

Structure of Atom

Solution:

No change by doubling mass of electrons however by reducing mass of neutron to half total atomic mass becomes $6 + 3$ instead of $6 + 6$. Thus it is reduced by $25\%$.