Question

The atomic number of an atom is also the number of _____________________ in an atom.

Answer 1

The atomic number tells you the number of Drotons in one atom of an element. It also tells you the number of electrons in a neutral atom of that element. The atomic number gives the "identity" of an element as well as its location on the periodic table. No two different elements will have the same atomic number.
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Answer 2

Explanation:

The atomic number of an atom is also the number of proton in an atom.