Question
Asked By RadiantSunset32 at
Answered By Expert
Gabe
Expert · 2.1k answers · 2k people helped
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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