If an atom has 123 protons, and a mass of 256, what is the atomic number of this element? A. 123 B. 256 C. 133 D. None of these

asked Jun 11, 2022 193k views

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If an atom has 123 protons, and a mass of 256, what is the atomic number of this element?

A. 123
B. 256
C. 133
D. None of these

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3 votes

123. The atomic number is always equal to the number of protons. It’s also always equal to the number of electrons

Carl Staelin answered Jun 18, 2022

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