alleryThe nuclei of isotopes of one element contain the same number of:
ANeutrons
BPositrons
CPhotons
DProtons
Answer & Solution
Correct answer: D. Protons
1. That is what makes them the same element.
2. Their masses differ all the same.
3. They share the same number of protons.
_Source: syllabus Physics, Ch 13 'Nuclei'_
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