Chemistry 115 Purdue Past Exam Questions with Complete Solutions

Chemistry 115 Purdue Past Exam Questions with Complete Solutions A gallium-69 ion (69Ga2+) contains (a) 69 protons, 31 neutrons and 33 electrons. (b) 31 protons, 38 neutrons and 29 electrons. (c) 31 protons, 69 neutrons and 29 electrons. (d) 69 protons, 31 neutrons and 29 electrons. (e) 31 protons, 38 neutrons and 33 electron (b) 31 protons, 38 neutrons and 29 electrons. The stable isotopes of neon (Ne) are: neon-20 (20Ne), neon-21 (21Ne), and neon-22 (22Ne). Neon-23 (23Ne), however, is radioactive. What is the most likely type of radioactive decay for neon-23? (a) beta decay (b) positron decay (c) electron capture (d) spontaneous fission (a) beta decay 3. What happens to the mass number and the atomic number of a radioactive nuclide when it undergoes electron capture? (e) The mass number does not change and the atomic number decreases by 1. Polonium-214 (214Po) undergoes radioactive decay in a series of four steps to produce a stable nuclide, Z. The series of steps, as shown below, involves the consecutive emission of an Alpha particle, a beta− particle, a Beta− particle, and another Alpha particle. Which one of the following is the correct identity of the final stable nuclide Z? Po214 → Q + α Q → X + β− X → Y + β− Y →