What is relative atomic mass?

Relative atomic mass is the average mass of an atom of an element compared to 1/12th of the mass of an atom of carbon-12. It is expressed in atomic mass units (amu) and is calculated by taking into account the abundance of each isotope of the element.

Relative atomic mass, also known as atomic weight, is the weighted average mass of all the isotopes of an element. It is defined as the ratio of the average mass of the atoms of an element to 1/12 of the mass of an atom of carbon-12. The relative atomic mass of an element is a dimensionless quantity and is often approximated to the nearest whole number.