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Which of the following is NOT the same for different isotopes of the same element?
Cost per Thousand (CPM)
A metric used in advertising to denote the price of 1,000 advertisement impressions on one webpage.
Frequency
The rate at which something occurs or is repeated over a particular period of time or in a given sample.
Reach
A measure of the extent to which content, advertising, or communication is seen by an audience.
Rating
A system or scale that evaluates or grades certain characteristics or performances, often used in contexts like entertainment, finance, or product quality.
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