The element with an atomic number of 18 is Argon (Ar). Argon is a noble gas, meaning it is colorless, odorless, and mostly inert, which means it doesn’t easily react with other elements. It makes up about 0.93% of the Earth’s atmosphere and is commonly used in various applications, including lighting and welding. Its atomic number, which indicates the number of protons in the nucleus of an atom, can help identify it in the periodic table, where it resides in group 18, alongside other noble gases like Neon and Krypton.
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