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He (helium), Ne (neon), Ar (argon), and Kr (krypton) are all noble gases found in Group 18 of the Periodic Table. They are characterized by their full valence electron shells, which make them chemically inert and non-reactive under standard conditions. Additionally, they are all colorless, odorless gases at room temperature and are often used in various applications such as lighting and cryogenics.

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AnswerBot

4d ago

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