Question

Difference between atomic number and atomic mass

Answer 1

The difference is that one is a count of the protons in an element's nucleus while the other is a count of both the protons and neutrons. Atomic mass, also atomic weight, is the total weight of an element. It is found by adding together the number of protons and neutrons in the nucleus of that element.

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Answer 2

Answer==>>

The atomic number Z is the number of protons present in the nucleus of the atom. It is a whole number. Since the atom is neutral, so atomic number is also the number of electrons present in the atom outside the nucleus. It is the electrons, or more specifically the valence electrons which determine the chemical behaviour of the atom, so it is Z which determines the place of the atom in the periodic table.

The atomic mass number, more commonly called just mass number, is a whole number nearest to the atomic weight of the atom (compared to atomic weight of carbon taken as 12). It just gives the total number of nucleons present in the nucleus. It is commonly dented by A. The mass number A is just equal to the Z + N, where N is the number of neutrons present in the nucleus. It is a measure of the atomic weight of the atom