The noble gases, which reside on the East Coast of the periodic table, are its aristocrats—detached and aloof, never bothering to interact with the rabble of common elements that make up the vast ...

Argon is part of a group of elemental gases known as noble gases. Each of the gases in this group consists of atoms whose outermost “shell” of electrons is fully occupied (helium, neon, krypton, xenon ...