Atomic Structure Question
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If an atom of calcium has a charge of +2, how many protons, neutrons, and electrons does it have?
- 20 protons, 40 neutrons, and 16 electrons
- 20 protons, 20 neutrons, and 18 electrons
- 20 protons, 20 neutrons, and 22 electrons
- 20 protons, 40 neutrons, and 18 electrons