Chemistry Crossword By Maija and Elise

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Across
  1. 2. Considered the rarest element on Earth
  2. 4. Density of around 12.9 g/cm³
  3. 5. Named from the Greek word for "stranger"
  4. 8. Highest atomic number and atomic mass
  5. 9. Melting point is 1132.2 Celsius
  6. 10. Boiling point is 2694.85 degrees Celsius
  7. 11. Used to make lasers
  8. 13. Name means "land of the rising sun"
  9. 14. Discovered by Paul Emile Lecoq de Boisbaudran in 1886
  10. 15. Considered the most harmful to people
Down
  1. 1. Melts below body temperature
  2. 2. First identified noble gas
  3. 3. Mas is 72.64u
  4. 6. Atomic mass is 259u
  5. 7. Can ignite spontaneously in air at 150 degrees Celsius
  6. 12. Density (when liquid) is 11.72 g/cm³