Periodic Table

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Across
  1. 2. the chemical symbol of lead.
  2. 3. the chemical symbol of iron.
  3. 4. which element's chemical symbol is Na?
  4. 6. this element has 8 protons.
  5. 7. atomic mass/weight - atomic number = ?
  6. 8. is the total number of protons plus the total number of neutrons.
  7. 9. this element has no neutrons in its nucleus.
  8. 10. this element has 10 electrons.
Down
  1. 1. is the same as the number of protons in atoms nucleus.
  2. 2. copper has 29 of these in its nucleus.
  3. 3. the number of neutrons in the nucleus of aluminum.
  4. 5. this element is liquid at room temperature and has an atomic mass/weight of 201.