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Explain how the isotopes of an element differ.

a. They each have a different number of electrons in their outermost energy level.
b. they each have a different number of protons in their nuclei.
c. they each have a different number of neutrons in their nuclei.
d.they each have a different charge.

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Isotope

are alternate mass forms of an element. It has the same number of protons and electrons but differ in their number of neutrons

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