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What makes hydrogen so basic and essential to the formation of matter and life—and sets it apart from all other elements in the universe—is its lack of a neutron. This makes hydrogen the simplest and smallest of all atoms, with only one proton at the center and one electron that orbits around it.It is the first element of the periodic table as its atomic number is one, which means it has only one electron in its atom and thus only one electron is present in its outermost shell. ... It can attain the noble gas configuration of helium, by accepting one electron