The correct answer is #4. They have the same number of protons but a different number of neutrons.
Answer:
the force of attraction between all masses in the universe; especially the attraction of the earth's mass for bodies near its surface
Explanation:
Becuz when you wash up in the tub you want layers of soap so you don’t stink
Answer:
because if someone close to u gets sick you would know how to cure it
Answer:
the number of neutrons and protons in an atom
