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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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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​

User Cauchi
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1 Answer

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