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22 May, 19:32

The total mass of the protons in an atom of gold-198 is approximately

(1) 79 atomic mass units

(2) 119 atomic mass units

(3) 198 atomic mass units

(4) 277 atomic mass units

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  1. 22 May, 19:49
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    Gold has an atomic number of 79

    Protons have a relative mass of 1

    Gold-198 is a radioactive isotope of gold, which means it has a different number of neutrons, but the same number of protons and electrons

    So the answer is (1) 79 atomic mass units
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