lilprincessttow6r6r lilprincessttow6r6r
  • 25-01-2018
  • Chemistry
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How many neutrons does element X have if its atomic number is 29 and its mass number is 99?

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Аноним Аноним
  • 25-01-2018
number of neutrons = mass number - atomic number

= 99-29 = 70 
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