If the relative molecular mass of an element is not a whole number, it can be deduced that the element is
Option D is correct because the relative atomic or molecular mass of an element is a weighted average of the masses of all its naturally occurring isotopes. Isotopes are atoms of the same element that have different numbers of neutrons, resulting in different mass numbers. Because these isotopes exist in varying percentages (abundances) in nature, their average mass is often a decimal rather than a whole number.
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