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14 November, 00:02

9. For the following questions, use a periodic table and your atomic calculations to find the unknown information about each isotope:

You have an neutrally charged isotope with a mass number of 99 and an atomic number of 43. How many protons?

99

43

56

142

+2
Answers (1)
  1. 14 November, 01:55
    0
    43 because the atomic number tells us how many protons there are in an atom.
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