The number of neutrons and protons together determines an elements mass number. Therefore, your answer would be C.
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Answer: The amount of substance of a system that contains as many elementary entities as there are atoms in 12 g of carbon-12
Explanation:
Answer: B
Explanation: sorry if I'm too late but i just did this question and that was the right answer
B: a liquid becomes a gas Let me know if it’s right or wrong