Question

difference between atomic mass and atomic number

Answer 1

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Atomic number is used to define the type of element a material or substance is. It is the number of protons present in an element’s nucleus.

The atomic mass, on the other hand, is the number of both the protons and neutrons present in the nucleus of the element. Electrons do not usually weigh much, so the atomic mass is calculated by adding the number of protons to neutrons. It is also referred to as the atomic weight.

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Answer 2

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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.


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