January 2020 NY Regents Chemistry Exam
27 Based on Table N, uranium-238 and uranium-235 have different
(1) decay modes
(2) half-lives
(3) numbers of protons
(4) numbers of electrons
Solution: According to Table N, U-238 has a half live of 4.47 × 109 y while U-235 has a half live of 7.04 × 108 y.
Answer: 2
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