Periodic Puzzle of Elements

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Across
  1. 3. An atom with a negative charge
  2. 4. The Periodic Table organizes different types of..
  3. 6. The period that contains Neptunium
  4. 9. The last name of the person that organized the periodic table
  5. 10. The first group is called the ______ metals
  6. 11. The period that contains Ytterbium
  7. 12. This group is extremely reactive gases
  8. 13. Has a positive charge
Down
  1. 1. An atom with a positive charge
  2. 2. part of the atom that participates in chemical reactions
  3. 5. A material's ability to bend without breaking
  4. 6. When you count the number of protons you get the ____ number
  5. 7. The majority of the elements in the periodic table are
  6. 8. When you add neutrons and protons
  7. 14. The ______ gases are not reactive