January 2019 NY Regents Chemistry Exam
31 The three nuclides, U-233, U-235, and U-238, are isotopes of uranium because they have the same number of protons per atom and (1) the same number of electrons per atom
(2) the same number of neutrons per atom
(3) a different number of electrons per atom
(4) a different number of neutrons per atom
Solution: Isotopes of an elements have the same number of protons but a different number of neutrons.
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