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(arn437) nanni 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 25 electrons.
correct
5. 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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