The document discusses the noble gases, which are unreactive elements in Group 18 of the periodic table. They rarely combine with other elements and are found in nature as uncombined atoms due to their low reactivity. Examples of noble gases discussed include helium, neon, argon, krypton, and radon. Common uses of the noble gases mentioned are balloons, lightbulbs, neon signs, and strobe lights. Radon gas requires special attention due to its radioactivity and potential to cause lung cancer if inhaled over long periods of time.

1. The Noble Gases