Answer: Isotopes of an atom are different because they have different atomic masses and different number of neutrons within their nucleus. They are the same since they will always have the same atomic number/number of protons in their nucleus.
Explanation:
The answer is BaO
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0.7 my teacher just gave me the answer i got too lazy to explain why
Dalton
Dalton's theory was the first scientific theory because it relied on scientific investigative processes.
