What does a helium atom consist of?

Mainly empty space A helium atom has by definition 2 protons, but the other things can vary. Helium atoms commonly have 2 neutrons, although this can vary with a small proportion having either 1 or 3 neutrons (very, very occasionally more or less). In a neutral atom (which is what helium is basicly all the time) there would be 2 electrons also (this can vary also but only in high-energy conditions The protons and neutrons can also be broken down into quarks (two up quarks and a down quark for each of the protons and two downs and an up for neutrons making 6 up and 6 down quarks altogether (usually, see above) (but I think that's a little too much detail...) The protons and the neutrons are all together in a clump called the nucleus of the atom with the electrons moving around elsewhere (not part of of the nucleus).

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