- (B) The^16 O and^17 O are isotopes of the same element because they do not
have the same number of neutrons. This difference in the number of neutrons
shows up in the mass number (superscript to the left of the chemical symbol).
The mass number of an element is the sum of the protons and neutrons in the
nucleus.
marvins-underground-k-12
(Marvins-Underground-K-12)
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