If the mass of neutrons is doubled & mass of electron is halved, then calculate the new atomic mass of ₆Carbon¹² and the percent by which it is increased.

6Carbon12 or 6C12

Number of electrons = 6

Number of protons = 6 = 6amu

Number of neutrons = 6 = 6amu

Total mass = (6 + 6) = 12 amu

Mass of the electron is negligible.

If the mass of the neutron is doubled, then the total mass = (6 × 2) + 6 = 18amu

Therefore, the % of the increase =(18 - 12)/12 ×100 = 50%

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Updated on: 10-Oct-2022

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