Science Periodic Table Puzzle

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12345678910111213141516171819
Across
  1. 5. I am in Group 18 and I start with N.
  2. 6. I am often used to purify the gas and my atomic volume is 8.9 cc/mol.
  3. 9. I am used for hardening platinum and my melting point is 2,447˚C.
  4. 11. My atomic number is 6 and my boiling point is 4,827˚C.
  5. 12. Chloride and I make up salt.
  6. 13. I am a shiny, dark- gray metal and my symbol is Ti.
  7. 15. I am the only liquid in the non-metal side.
  8. 18. I have an atomic mass of 32.06.
  9. 19. My melting point is 1,064˚C.
Down
  1. 1. I am all around you. People need me to breathe.
  2. 2. I am used for high temperature thermometers.
  3. 3. My atomic number is 1 in each hydrogen atom.
  4. 4. My atomic number is 2.
  5. 6. I am used to make safety matches and tracer bullets.
  6. 7. I am the only liquid metal.
  7. 8. I am used in alloys with low melting point.
  8. 10. I am the second lightest halogen and I am used in swimming pools.
  9. 14. I am not soluble under water in normal circumstances and my atomic mass is 26.982.
  10. 16. I am used in glow tubes and my atomic number is 18.
  11. 17. I am part of the pencil that help people write.