An atom is determined to contain 12 protons, 10 electrons, and 12 neutrons. What are the mass number and charge of this atom or ion? Select one: a. mass number: 24, charge: +2 b. mass number: 22, charge: neutral c. mass number: 34, charge: -2 d. mass number: 34, charge: +2

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Mass number= atomic number + number of  neutrons. A=Z+N Z=number of protons=12 N=12 A=12+12=24 If, we have 12 protons and 10 electrons, the charge of this ion is +2 Therefore: mass number:24; charge: +2 Answer: a. mass number: 24; charge: +2

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