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6. How many electrons can the first electron shell hold?

  • 16
  • 2
  • 8
  • 1

7. What is the symbol for Sodium?

  • So
  • Na
  • S
  • Ns

8. Where is the nucleus in an atom?

  • In the neutrons.
  • In the middle of an atom.
  • In shells around the atom.
  • Nuclei aren't in atoms.

9. How do you find out how many neutrons there are in an atom given the atomic number and the mass number?

  • Add the mass number and atomic number.
  • Take the atomic number away from the mass number.
  • Take the mass number away from the atomic number.
  • Divide the mass number by the atomic number.

10. Which of these is correct?

  • A nucleus has a positive charge.
  • Electrons have a positive charge.
  • An atom has a positive charge.
  • Neutrons have a positive charge.