If the atomic number of an element is 7 and its mass number is 18, how many neutrons are in the atom's nucleus?

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Fitzgerald

Chemistry

7 September, 08:50

If the atomic number of an element is 7 and its mass number is 18, how many neutrons are in the atom's nucleus?

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Salvador Banks · Answer 1

To find neutrons, you locate the atomic mass and round it off, then locate the atomic number and subtract the two. So here you'd have 18 - 7, leaving you with 11 neutrons. Protons and electrons are equal to the atomic number.