AP Chemistryeasymcq1 pt
The mass number of an atom is equal to:
A.The number of electrons
B.The number of neutrons
C.The number of protons
D.The number of protons plus neutrons
Explanation
Core Concept
The mass number (A) equals the total number of protons (Z) plus neutrons (N): A = Z + N.
Correct Answer
DThe number of protons plus neutrons
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