Which statements explain a tabulated relative atomic mass? Select all that apply.
It is simply the element's proton count.
It reflects the isotope masses present in the sample.✓Bonne réponse
It is the mass number of every atom of the element.
More abundant isotopes contribute more strongly to the mean.✓Bonne réponse
Every isotope contributes equally regardless of abundance.
Explication
Relative atomic mass combines isotope masses according to their abundances, so common isotopes influence the mean more strongly. An unweighted calculation would wrongly give rare and abundant isotopes equal influence.