6 Difference Between Atomic Mass And Atomic Number

S.NO.	Atomic Mass	Atomic Number
1.	The atomic mass of an element is the mass of a single atom of that element.	The atomic number is the number of protons present in the nucleus of an atom of that element.
2.	The atomic mass is expressed in atomic mass units (amu).	The atomic number is expressed as a whole number.
3.	The atomic mass is determined by the mass of the protons, neutrons, and electrons present in the atom.	The atomic number is determined by the number of protons present in the nucleus.
4.	The atomic mass is used to calculate the mass of a molecule or compound.	The atomic number is used to classify elements into the periodic table.
5.	The atomic mass can vary slightly due to the presence of isotopes.	The atomic number is always the same for a given element.
6.	The atomic mass is affected by external factors such as temperature and pressure.	The atomic number is not affected by external factors.

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