a
They have the same number of electrons in their outermost shells
b
They have different atomic masses
c
They have the same atomic number and the number of electrons
d
They have the same atomic number but different number of electrons
Explanation
Correct Option
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Discussions (7)
SwanRyder
4 years ago
normally isotopes doffer in mass number due to the difference in the number of neutrons not electrons
Osaima
11 years ago
WRONG!!!! isotope only differs in their mass which can only be as a result of their number of neutron .its only ion of an element that differs in their electron number
