The atomic mass could be roughly estimated by adding the number of protons and the number of neutrons in the atom.
How could you approximate that atomic mass of an element?
It should be known that the atomic mass is obtained by summing up the masses of all the isotopes of the element. This is the accurate way to obtain the value of the relative atomic mass.
However, in an instance where we do not want to calculate the precise atomic mass for one of the elements, you could simply add the number of protons and the number of neutrons in the atom. This gives us a rough estimate of the mass of the atom.
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