That0neH1s0kaS1mp That0neH1s0kaS1mp

02-09-2021
Biology

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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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02-09-2021

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

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