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An ion that consists of 7 protons, 9 neutrons, and 10 electrons has a net charge of



January 2018 NY Regents Chemistry Exam


31 An ion that consists of 7 protons, 9 neutrons, and 10 electrons has a net charge of

(1) 2-

(2) 2+ (3) 3+

(4) 3-


Solution: An electron has a charge of -1. A proton has a charge of +1. A neutron has a charge go 0. 7 protons is +7 and 10 electrons is -10. +7-10= -3

Answer: 4


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