The Noble Gases
The very last column, Group 18, is the noble gases. These elements are the most stable out of all the elements and are generally unreactive. The elements that are considered noble gases are Helium(He), Neon(Ne), Argon(Ar), Krypton(Kr), Xenon(Xe), and Radon(Rn). The noble gases' valence level is completely filled with electrons. Except for helium, the rest of the noble gases' valence level is an octet. All of the noble gases have zero as its oxidation state, except for argon and krypton that have other oxidation states excluding 0. Most of the noble gases, excluding Xenon, do not have electronegativity.
Information on the Noble Gases
Helium(He) is element #2 and is the only noble gas with a duet, 2 electrons in its valence shell. It was named after the Greek god Helios, the sun god. It used in helium-filled balloons, balloon tanks and Helium-neon laser pointers.
Neon(Ne) is element #10. The element actually makes up neon lights. It doesn't like to react with other elements. Neon is used in hollow cathode lamps, neon indicator lights, and in a helium-neon laser.
Argon(Ar) is element #18 and is the cheapest gas. That's why it is used in ordinary or incandescent light bulbs, instead of xenon or krypton. It is also used in wine preservers, violet ray machine(a fake medical machine), double-pane windows, signal lamps, and argon gas valves.
Helium(He) is element #2 and is the only noble gas with a duet, 2 electrons in its valence shell. It was named after the Greek god Helios, the sun god. It used in helium-filled balloons, balloon tanks and Helium-neon laser pointers.
Neon(Ne) is element #10. The element actually makes up neon lights. It doesn't like to react with other elements. Neon is used in hollow cathode lamps, neon indicator lights, and in a helium-neon laser.
Argon(Ar) is element #18 and is the cheapest gas. That's why it is used in ordinary or incandescent light bulbs, instead of xenon or krypton. It is also used in wine preservers, violet ray machine(a fake medical machine), double-pane windows, signal lamps, and argon gas valves.