Isotopes of an element have the same number of ________ and different numbers of ________.
A. protons; neutrons
B. protons; electrons
C. neutrons; protons
D. electrons; protons
Answer:A
Isotopes of an element have the same number of ________ and different numbers of ________.
A. protons; neutrons B. protons; electrons C. neutrons; protons D. electrons; protons