Mathematics
Mathematics, 08.02.2021 06:50, marcedezebrown4736

An atom of a certain element has 21 protons, 21 electrons, and a mass number of 45. How many
neutrons are in this atom?

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Answers: 3
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An atom of a certain element has 21 protons, 21 electrons, and a mass number of 45. How many
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