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What is the mass number of an element that has 21 protons, 21 electrons, and 22 neutrons?
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24 votes
What is the mass number of an element that has 21 protons, 21 electrons, and 22
neutrons?

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1 Answer

12 votes

Answer:

43

Step-by-step explanation:

Mass number(M) = Proton number + Neutron number

M=21+22

M=43

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