Regents Chemistry Exam August 2024 Question 3
3 Which phrase describes the protons and neutrons in atoms of two different isotopes of the same element?
(1) the same number of protons and the same number of neutrons
(2) the same number of protons and a different number of neutrons
(3) a different number of protons and 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 number of protons) that have a different mass, and therefore a different number of neutrons. Choice 2 is the correct answer.
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