Correct Answer: Option D

Explanation

4 moles of chlorine gas = 4Cl\(_2\) = 8 atoms of chlorine
3 moles of ozone = 3O\(_3\) = 9 atoms of oxygen
1 mole of butane = C\(_4\)H\(_{10}\)
7 mole of argon = 7Ar = 7 atoms of argon

Argon is a monoatomic noble gas with the least number of atoms.

There is an explanation video available below.

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