Which gas among the following is NOT typically used in neon lights?

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In neon lights, the typical gases used are neon, helium, and krypton, as these gases emit vibrant colors when an electric current passes through them. Neon is the most commonly associated gas with these lights, providing a bright reddish-orange glow. Helium and krypton can also be incorporated to produce different colors and effects.

Oxygen, however, is not typically used in neon lights for a few reasons. Firstly, oxygen does not contribute the same type of light emission as the noble gases do; it can actually react with the other materials in the light, which can lead to reduced efficiency and potential damage. Thus, it is excluded from the composition of neon lights. The characteristics and chemical behavior of oxygen make it unsuitable for this application, in contrast to the noble gases that are stable and safe under the conditions utilized in neon lighting.