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Elements are defined by the number of their:

ANeutrons
BElectrons
CNucleons
DProtons
Answer & Solution
Correct answer: D. Protons
1. All atoms of one element share an atomic number. 2. That number counts one kind of particle. 3. Elements are defined by their protons. _Source: syllabus Science, Ch 4 'Structure of the Atom'_
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