Which statement is true about two isotopes of the same element?
AThey have the same mass number.
BThey have different numbers of protons.
CThey have different locations on the periodic table.
DThey have different numbers of neutrons.
AThey have the same mass number.
BThey have different numbers of protons.
CThey have different locations on the periodic table.
DThey have different numbers of neutrons.