Difference Between Atomic Mass and Atomic Number

Atomic Mass Vs Atomic Number:

Another name of Atomic mass is Atomic Weight. Atomic mass or Atomic weight is the weighted average mass of an atom of an element which is based on the relative natural abundance of isotpoes of the elements. Whereas on the other hand mass number or atomic number is basically a count of the number of protons and neutrons in the nucleus of an atom.

difference between atomic mass and atomic number

Atomic Mass:

The mass or weight of an atom of an element is expressed in atomic mass units. the Atomic mass is usually equivalent to the number of protons and neutrons in the atom or is equal to the relative abundances of different isotopes.

Atomic Number:

Atomic number is also known as proton number and its symbol is Z. Atomic number is the number of protons found in the nucleus of an atom. Atomic number is usually identical to the charge number of the nucleus. Because of the Atomic number one can easily identify a chemical element. In Charged Atom the number of proton and electron are different from each other.

Main differences between Atomic Mass and Atomic Number:

The following are some of the major differences between Atomic mass and atomic number.

  • Atomic number refers to the number of protons of an atom whereas atomic mass is the sum of number of protons and neutrons of an atom.
  • Atomic number is not affected by the number of neutrons whereas on the other hand Atomic mass is greatly affected by the number of neutrons of an atom.
  • In Atomic number all the isotopes has same atomic number whereas all the isotopes have different atomic mass in an atom.
  • Atomic number always have a smaller value while comparing it to the atomic mass of the atom.

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