Correct Answer: Option A

Explanation

The relative atomic mass of an element is calculated as a weighted average of the masses of its naturally occurring isotopes. Because the isotopes of chlorine (\(^{35}\)Cl and \(^{37}\)Cl) occur in different proportions (natural abundance), their masses are averaged according to those percentages. The resulting value (approximately 35.5) is not a whole number because it reflects this proportional distribution rather than the mass of a single atom.

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