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What is the net charge on an ion that has 9 protons, 11 neutrons, and 10 electrons?
(1) 1+ (3) 1–
(2) 2+ (4) 2–
The answer is (3). You find net charge by subtracting the number of electrons from the number of protons (since protons are positive and electrons are negative). 9 - 10 = -1
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