Question

The atomic number of an atom is based upon the number of​

Answer 1

The atomic number of an element is based on the number of protons in the atomic nuclei of its atoms.

Answer 2

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Step-by-step explanation:

Atoms of each element contain a characteristic number of protons. In fact, the number of protons determines what atom we are looking at (e.g., all atoms with six protons are carbon atoms); the number of protons in an atom is called the atomic number.