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Helium-4 has 2 protons and 2 neutrons. The less common helium-3 has 2 protons but only 1 neutron. There are also several additional isotopes (that is, different number of neutrons), but those are unstable (radioactive).

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How many neutrons electrons does helium have?

Helium-3 has 1 neutron and 2 electrons. Helium-4 has 2 neutrons and 2 electrons.


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How many neutrons would you expect to find in a helium atom?

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