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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