Helium has a total of two electrons in the outermost shell of its electronic configuration.
The number of electrons in a neutral in an atom is known as its atomic number. It is equal to the number of protons in the nucleus of the atom. The number of electrons present especially in the outermost shell of an atom has a profound effect on the reactivity of that atom.
Atoms that have 18 electrons have eight electrons in their outermost shell and they are unreactive. Some atoms have four electrons and only two electrons in their outermost shell.
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