Atoms and Elements

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Across
  1. 2. Scientific name heard in chemistry class
  2. 5. Sunblock metal
  3. 7. Pb, in chemistry
  4. 10. Table entry?
  5. 11. Nonreactive
  6. 12. Tiny negative particle
  7. 13. Neutral particle in an atom
  8. 17. Radioactive gas
  9. 18. Molecule part
Down
  1. 1. Metal that gave its name to a shade of blue
  2. 3. Outer electron count
  3. 4. Atomic variant
  4. 6. Fe on the periodic table
  5. 8. Gas in a dinner sign
  6. 9. Noble gas in bulbs
  7. 14. Sn, to a chemist
  8. 15. Positive particle in the nucleus
  9. 16. Type of metal group