However atomic mass the mass of one mole atoms. Mass number is the sum of neutrons and protons or number of nucleons present in the nucleus of the atom, and mass number is always a whole number. Note – In the calculation of atomic weight through Dulong and petit’s method specific heat of the element must be present in calorie.ĭo not get confused with atomic mass and mass number (A). For example the atomic weight of an oxygen atom is $16$ and so $\text$ The atomic mass of an element is defined as the average weight of atoms of the element relative to the carbon atom, taken as exactly $12$. Thus, Davy is considered to be the discoverer of calcium.Hint Atomic mass is the mass of one mole atom.
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