Explain how the isotopes of an element differ.
AThey each have a different number of electrons in their outermost energy level.
Bthey each have a different number of protons in their nuclei.
Cthey each have a different number of neutrons in their nuclei.
d.they each have a different charge.
AThey each have a different number of electrons in their outermost energy level.
Bthey each have a different number of protons in their nuclei.
Cthey each have a different number of neutrons in their nuclei.