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nanni (arn437) Atoms and Isotopes - video CNS (87654) 1 This print-out should have 3 questions. Multiple-choice questions may continue on the next column or page find all choices before answering. 001 10.0 points A magnesium (Mg) atom with a mass number of 25 contains 1. 25 protons, 13 neutrons and 25 elec- trons. 2. 13 protons, 12 neutrons and 12 elec- trons. 3. None of these 4. 12 protons, 13 neutrons and 12 electrons. correct 5. 25 protons, 25 neutrons and 25 elec- trons. Explanation: 002 10.0 points How many protons, neutrons, and electrons are present in the 13 C- ion? 1. 7 protons, 6 neutrons, 8 electrons 2. 6 protons, 7 neutrons, 8 electrons 3. 6 protons, 7 neutrons, 6 electrons 4. 7 protons, 7 neutrons, 7 electrons 5. 7 protons, 6 neutrons, 7 electrons 6. 7 protons, 6 neutrons, 5 electrons 7. 6 protons, 7 neutrons, 7 electrons correct 8. 6 protons, 7 neutrons, 5 electrons 9. 7 protons, 6 neutrons, 6 electrons Explanation: Carbon can only have 6 protons. 13 - 6 = 7 neutrons 6 + 1 = 7 electrons 003 10.0 points Isotopes of an element have the same number of 1. neutrons, but different numbers of pro- tons. 2. protons, but different numbers of elec- trons. 3. protons, but different numbers of neu- trons. correct 4. electrons, but different numbers of pro- tons. Explanation: Definition... View Full Document

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