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6. Why are most atoms neutral?

  • Because they have an equal number of protons and electrons
  • Because they have more neutrons than anything else

7. What is the radius of an atom?

  • 1 × 10-10 m
  • 1 x 10-15 m

8. What is the radius of a nucleus?

  • 1 x 10-14
  • 1 x 10-13

9. What are ions?

  • Neutral particles
  • Charged particles that form when atoms lose or gain electrons
  • A group of electrons

10. What is the mass number?

  • Number of electrons plus the protons
  • Number of protons and neutrons
  • Number of electrons minus the neutrons
  • Number of neutrons and electrons

11. What is an isotope?

  • A variant of an element with a different number of protons but the same number of neutrons
  • A variant of an element with the same amount of electrons, protons and neutrons
  • A variant of an element with the same number of protons but a different number of neutrons
  • A variant of an element with a different number of electrons