Atoms and isotopes - video-solutions

Atoms and Isotopes - video-solutions
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Unformatted text preview: nanni (arn437) Atoms and Isotopes - video CNS (87654) This print-out should have 3 questions. Multiple-choice questions may continue on the next column or page nd all choices before answering. 1 6 + 1 = 7 electrons 003 10.0 points Isotopes of an element have the same number of 001 10.0 points A magnesium (Mg) atom with a mass number of 25 contains 1. neutrons, but dierent numbers of protons. 1. 25 protons, 13 neutrons and 25 electrons. 2. protons, but dierent numbers of electrons. 2. 13 protons, 12 neutrons and 12 electrons. 3. protons, but dierent numbers of neutrons. correct 3. None of these 4. 12 protons, 13 neutrons and 12 electrons. correct 5. 25 protons, 25 neutrons and 25 electrons. Explanation: 002 10.0 points How many protons, neutrons, and electrons are present in the13 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 4. electrons, but dierent numbers of protons. Explanation: Denition ...
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