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Question

The sum of the number of electrons, protons and neutrons in the three isotopes (12C,13C,14C) of carbon is:

A
36
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B
57
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C
18
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D
39
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Solution

The correct option is B 57
Carbon has an atomic number of 6.
Isotopes of carbon are: 12C,13C,14C

SymbolNeutronsProtonsElectrons12C66613C76614C866211818
21+18+18=57

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