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51 Answer: D The mass number (above and to the left of the element symbol) shown is 222. The mass number is equal to the number of protons plus the number of neutrons. The atomic number (below and to the left of th
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Document Date: 2016-03-23 03:45:31
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51 Answer: D The mass number (above and to the left of the element symbol) shown is 222. The mass number is equal to the number of protons plus the number of neutrons. The atomic number (below and to the left of th