Question

As 1 amu is equal to neutron/proton then why we take reletive mass of carbon 12 atom but not as reletive mass of hydrogen atom.​

Answer 1

Answer:

The relative abundance of Deutrium (1 proton, 1 neutron) is so small that it is barely accounted for when calculating the average atomic mass. So the mass of a proton is around 1.008 amu, not 1. ... Scientists used carbon-12 because no other atom has exact whole-number masses in the amu scale

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