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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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An atom of a certain element has 21 protons, 21

electrons, and a mass number of 45. How many
neutrons are in this atom?

User Molo
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7.5k points

1 Answer

13 votes
45-21=24 neutrons :)

As the generally accepted mass of an electron is 0. So, to find the mass of neutrons, minus the protons from the total mass.
User Zadiki Hassan Ochola
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7.4k points
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