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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: NCERT Class 9 Science, Ch 4 'Structure of the Atom'_
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