June 2011 Chemistry Regents #51

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Questions 1-10 Questions 11-20 Questions 21-30 Questions 31-40 Questions 41-50

Question 51 Questions 52-54 Questions 55-59 Questions 60-61 Questions 62-63 Questions 64-65 Questions 66-68 Questions 69-70 Questions 71-73 Questions 74-76 Questions 77-79 Questions 80-82 Questions 83-85

Question

Base your answers to questions 51 on the information below.

51. Explain, in terms of protons and neutrons, why U-235 and U-238 are different isotopes of Uranium. [1]

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same number of protons and different numbers of neutrons

U-235 has 92 protons and 143 neutrons; U-238 has 92 protons and 146 neutrons

on to Questions 55-59