Atoms and isotopes - video-solutions

Atoms and Isotopes - video-solutions
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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 – fnd 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
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Unformatted text preview: 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 di±erent numbers oF pro-tons. 2. protons, but di±erent numbers oF elec-trons. 3. protons, but di±erent numbers oF neu-trons. correct 4. electrons, but di±erent numbers oF pro-tons. Explanation: Defnition...
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