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The number of protons in the nucleus is called the _ _ or the _ _ _.
atomic number / proton number Z.
The atomic number defines the _ _ of an element.
chemical identity
The total number of protons plus neutrons in the nucleus (the total number of nucleons) is called the _ _ _.
It is the _ that are responsible for almost all of the mass of an atom because _ weigh virtually nothing.
mass number A.
nucleons / electrons
Atoms with the same number of protons but different numbers of neutrons and different masses are called _.
isotopes.
Different isotopes of the same element react chemically in exactly the same way as they have the _ _ _.
same electron configuration.
Atoms of different isotopes of the same element vary in _ _ because of the different number of neutrons in their nuclei.
mass number
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