Question

Isotopes of an element have the same number of ________ and different numbers of ________.

A. electrons... protons
B. protons... electrons
C. protons... neutrons
D. neutrons... protons

Answer 1

C. Protons... neutrons

Answer 2

Answer: C

Explanation:

Isotopes has the same atomic number which is the same as number of proton but different mass number.

Mass number = proton + neutron A change in the number of neutrons affect the mass number