PERIODIC TABLE OF ELEMENTS

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Across
  1. 2. atomic # is 19
  2. 5. natural state is alkali metal
  3. 6. has 3 stable isotopes
  4. 8. discovered by joseph black
  5. 9. 26 neutrons and 222 protons
  6. 11. one of the rarest gases o earth
  7. 13. used to make fun powder
  8. 14. hard brittle crystalline
Down
  1. 1. solid at a room temperature
  2. 3. natural state is gas
  3. 4. fast metal to be discovered
  4. 7. discovered in 1875
  5. 10. in romiun era was named cyprus
  6. 12. poisonous if inhale