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Atomic disguise makes helium look like hydrogen 8: Helium Atom - Chemistry LibreTexts - Physical Chemistry The helium atom has two electrons bound to a nucleus with charge Z = 2. The successive removal of the two electrons can be diagrammed as He I1 → He + + e − I2 → He + + + 2e − The first ionization energy I1, the minimum energy required to remove the first electron from helium, is experimentally 24.59 eV. Helium (He) - Physical & Chemical Properties, Uses, Isotopes - BYJUS Helium falls under inert gas since its outermost electron orbital is full of two electrons. Helium can also be found in lasers, compressed air tanks and coolant in nuclear reactors. It holds the lowest boiling and melting points amongst all other elements. Nuclear fusion of hydrogen in stars generates a significant amount of helium. Isotopes Parts of a helium atom