13. Which statements about isotopes of the same element are correct? !
)
They are atoms which have the same chemical properties because they have the
same number of electrons in their outer shell.
2
They are atoms which have the same number of electrons and neutrons but
different numbers of protons.
3 They are atoms which have the same number of electrons and protons but different
numbers of neutrons.
A 1 and 2
B 1 and 3 C 2 only
D 3 only
