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24 November, 00:51

The mass number of an isotope of argon that contains 20 neutrons is

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  1. 24 November, 02:03
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    In an atom, protons and neutrons have a relative mass of 1, so adding the numbers of each will give you the mass number of the atom. The atomic number of argon is 18, meaning that it has 18 protons. 18+20=38, so the mass number of the carbon isotope is 38.
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