Why are the atomic masses of some elements in paratheses?

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Why are the atomic masses of some elements in paratheses?

2007-04-23 12:33:05 · 2 answers · asked by Anonymous in Science & Mathematics ➔ Chemistry

2 answers

those elments are the ones that are radioactive and the most stable isotope of the element is chosen for the atomic mass.

2007-04-23 12:34:42 · answer #1 · answered by Luthien 4 · 1⤊ 0⤋

They are also the elements that have been created and that do not occur naturally. The atomic masses of most elements reflects the natural abundance of multiple isotopes of the elements.

2007-04-23 12:38:05 · answer #2 · answered by hcbiochem 7 · 1⤊ 0⤋