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What is the atomic number of argon (Ar) ? The Periodic Table A. 18 B. 8 C. 3 D. 40

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Answer

A

Explanation

The atomic number of an element is determined by the number of protons in the nucleus of its atom. In the Periodic Table, argon (Ar) is represented by the atomic number 18, which means it has 18 protons in its nucleus. Therefore, the correct answer is A. 18.

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