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2. Positively charged ions form when...

  • Electrons are lost
  • Electrons are gained

3. Isotopes of an element have the same atomic number but different mass number. True or false?

  • True
  • False

4. 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

5. What is the radius of a nucleus?

  • 1 x 10-14
  • 1 x 10-13
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