Cu-63 atoms are different from Cu-65 atoms in that they contain 2 or fewer less neutrons. Cu-63 and Cu-65 have 34 and 36 neutrons, respectively, in each atom.
The atomic number of copper is 29, and it has the mass number 63. The mass number is equal to the sum of the protons and neutrons in the nucleus, while the atomic number refers to the quantity of protons in the nucleus. This indicates that the nucleus of the copper atom contains 34 neutrons and 29 protons, for a total of 63 protons. This atom has the mass number 63 because it is a copper-63 atom. The number that corresponds to that element on the predictable serves as the atomic number, which is the same for every atom of a given element.
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