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How many protons are in 40Ar?

Anonymous

∙ 9y ago

Updated: 8/11/2025

The isotope 40Ar (argon-40) has 18 protons. The number of protons in an element is determined by its atomic number, and for argon, the atomic number is 18. This means that every atom of argon, including argon-40, contains 18 protons.

AnswerBot

∙ 1mo ago

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