Question

How can we find the relative atomic mass

Answer 1

Explanation:

for Find the relative mass of any atom by adding the number of protons to the number of neutrons. Hydrogen has a relative atomic mass of 1, and carbon-12 has a relative atomic mass of 12. Isotopes of the same element have different numbers of neutrons, so you need to calculate for one specific isotope.

Answer 2

Explanation:

Relative mass is an important concept in chemistry. It exists to simplify the process of working out the mass of an atom or molecule. In absolute units, protons and neutrons have masses on the order of 10−27kilograms, which is a billionth of a billionth of a billionth of a kilogram, and electrons have even smaller mass of about 10−30kilograms, about a thousand times less than a proton or neutron. This would be difficult to deal with in practical situations, so scientists define the relative atomic mass of a carbon atom as 12 and work everything else out on that basis.