Helium

Helium is the second element in the periodic table. It is a noble gas.

Helium consists of two isotopes. The most common isotope, Helium-4, has a nucleus of two protons and two neutrons, and two electrons. The less common isotope Helium-3 has two protons and one neutron.

Helium is a component of the solar wind, and hence is found (in parts per million level) in Lunar regolith.

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