Considering the definition of atomic number and atomic mass, the isotopes of an element are those in which their atomic numbers (that is, the number of protons) and electrons are equal, but the number of neutrons is different, that is, the mass number varies.
First, you have to know that the atomic number (which is identified by the letter Z) indicates the amount of protons that is present in the nucleus of an atom. This number is then responsible for defining the electronic configuration of the atom and the chemical properties of the element.
Then it is possible to say that the number of protons in the nucleus, that is to say the atomic number Z, of an atom determines its identity.
Oh the other side, the mass number or atomic mass represents the number of protons and neutrons found within the nucleus of the atom. That is, the sum of the protons and neutrons present in the nucleus of an atom, gives us the mass number. It is symbolized with the letter A.
Thas is, the mass number (A) of an atom is the sum of the atomic number (Z) and the number of neutrons (N).
Finally, the isotopes of an element are those in which their atomic numbers (that is, the number of protons) and electrons are equal, but the number of neutrons is different, that is, the mass number varies.
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