The atomic mass of an atom is the average mass of all the isotopes of that element, taking into account their relative abundance. It is usually expressed in atomic mass units (amu).
The atomic mass considers the sum of the masses of protons, neutrons, and electrons in the atom. The atomic mass is crucial in chemical calculations, such as determining the mole-to-gram conversion or finding the percentage composition of elements in compounds.
The SI unit of mass is the kilogram, but atomic mass is often expressed in amu because it is a more convenient unit for measuring the masses of atoms.
The atomic mass of an element can vary slightly, depending on the isotopes of that element.
The atomic mass of an element is an important property of that element. It is used to calculate the mass of a mole of that element, and it is also used to determine the chemical properties of that element.