Periodic Table of Elements

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Across
  1. 3. a metalloid
  2. 7. soft and have soft luster
  3. 8. natural state is a brown amorphous brown solid
  4. 10. Greek word chloros mean yellow green
  5. 13. 3 stable isotopes
Down
  1. 1. semi conductor
  2. 2. in group 13 in the periodic table
  3. 3. discovered in 1807
  4. 4. one of the rarest gases on Earth
  5. 5. discovered in 9000BC
  6. 6. atomic number 22
  7. 9. was the first metal to be discovered
  8. 11. atomic number is 1
  9. 12. 7th most abundant element in the universe