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18-07-2019
Chemistry

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A particle with 10 protons, 11 neutrons, and 12 electrons has a mass number of:

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Аноним Аноним

29-07-2019

For any given element the mass number can be found by adding the protons and the neutrons.

In this case its 10 protons plus 11 neutrons which gives us 21 as the mass number.

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