January 2020 NY Regents Chemistry Exam
3 Two atoms that are different isotopes of the same element have
(1) the same number of protons and the same number of neutrons
(2) the same number of protons but a different number of neutrons
(3) a different number of protons but the same number of neutrons
(4) a different number of protons and a different number of neutrons
Solution: Isotopes are atoms of the same element (same atomic number which means same number of protons) that have different mass (different number of neutrons).
Answer:2
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