Periodic table

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Across
  1. 3. Scientist who created the first periodic table
  2. 4. Elements on the left side of the table; good conductors
  3. 7. The smallest unit of matter
  4. 11. Group 18 elements known for being unreactive
  5. 12. Negatively charged particle found outside the nucleus
  6. 13. Vertical columns on the periodic table
  7. 14. Horizontal rows on the periodic table
Down
  1. 1. Elements on the right side of the table; poor conductors
  2. 2. Table that organizes all known elements
  3. 4. Elements with properties of both metals and nonmetals
  4. 5. Number of protons in an atom; defines the element
  5. 6. Group 1 elements that are very reactive metals
  6. 8. Neutral particle in the nucleus
  7. 9. Positively charged particle in the nucleus
  8. 10. Center of an atom containing protons and neutrons