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The atomic number is the Group of answer choices same as the mass number of an atom. number of protons in a nucleus. number of protons and neutrons in a nucleus. number of neutrons in a nucleus.
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The atomic number is the Group of answer choices same as the mass number of an atom. number of protons in a nucleus. number of protons and neutrons in a nucleus. number of neutrons in a nucleus.

User Kenshinman
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9 votes

Answer:

number of protons in a nucleus

Step-by-step explanation:

number of protons in a nucleus. The number of protons in the nucleus is, by definition, the atomic number.

User Fung
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