Question

Isotopes of the same element have different ____.

a. positions on the periodic table
c. atomic numbers
b. chemical behavior
d. mass numbers

Answer 1

The answe is D. Mass number

Answer 2

d. mass numbers

Step-by-step explanation:

Isotopes are atoms that have the same number of protons (atomic number) but different number of neutrons. As the definition of mass number is the sum of protons and neutron in an atom, the isotopes have different mass numbers.