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The atomic NUMBER of an element equals the number of:
ATotal particles in the nucleus
BElectrons in the outermost shell only
CProtons in the nucleus
DNeutrons in the nucleus
Answer & Solution
Correct answer: C. Protons in the nucleus
Atomic number (Z) = number of protons in the nucleus. It defines what the element is: hydrogen Z = 1, helium Z = 2, …, carbon Z = 6, oxygen Z = 8. A neutral atom also has Z electrons, so for a neutral atom Z also equals the electron count.
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