Chemistry Chapter 3 Atomic Structure Test
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Questions and Answers

How many electrons does an atom with an atomic number of 8 have?

  • 8 (correct)
  • 18
  • 12
  • 16

    • What is the atomic number of an element with 5 protons?

  • 20
  • 10
  • 15
  • 5 (correct)

    • What is the total number of protons and neutrons in an atom with an atomic number of 20 and a mass number of 40?

  • 40
  • 60 (correct)
  • 80
  • 20

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