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A helium atom has 2 protons and 2 neutrons.what is the mass number of this atom?

A helium atom has 2 protons and 2 neutrons.what is the mass number of this atom?
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A helium atom has 2 protons and 2 neutrons.what is the mass number of this atom?

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User Suselrd
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1 Answer

1 vote
4. Just add the protons and neutrons together.
answered
User Nettle
by
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