21. Nuclear Chemistry
Intro to Radioactivity
Multiple Choice
Multiple ChoiceThe mass number of an isotope is
A
the number of protons in the nucleus.
B
the number of neutrons in the nucleus.
C
the number of electrons in the nucleus.
D
the sum of the number of protons and neutrons in the nucleus.
E
the sum of the number of protons and electrons in the nucleus.
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