The Periodic Table

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Across
  1. 4. negative subatomic particle.
  2. 5. vertical columns on the periodic table.
  3. 8. The elements that are in between the zigzag line on the periodic table.
  4. 9. To be unreactive with other elements.
  5. 11. number of protons and neutrons.
Down
  1. 1. the electrons in the outermost energy level.
  2. 2. The elements that are on the far upper right corner of the periodic table.
  3. 3. Name of metals in group 3-12 that have many useful properties.
  4. 6. Elements in group 17.
  5. 7. Elements in group 18, very unreactive.
  6. 10. horizontal rows on the periodic table.
  7. 12. number number of protons in an element.