Period Table ：Element Crossword Challenge

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123456789101112131415
Across
  1. 3. – The third most abundant element in the universe.
  2. 5. – A soft metal which explodes in water.
  3. 6. - The gas that makes up about 78% of the air, crucial for building proteins and DNA.
  4. 9. - A metal with excellent electrical conductivity, it can be found in alloy bronze.
  5. 11. – A critical safety part of bulbs.
  6. 13. - The only natural isotope in nature that can undergo a self-sustaining nuclear fission chain reaction.
  7. 14. - the second most abundant element in the universe.
  8. 15. – Discovered by Curies and named after their motherland.
Down
  1. 1. - The lightest and most abundant element in the universe
  2. 2. – The second most abundant element in Earth's crust.
  3. 4. - A bright yellow solid with a smell of rotten eggs.
  4. 7. - A vital component of hemoglobin in human blood.
  5. 8. – A material named after a country. It is primarily known as an important semiconductor and is uniquely used in infrared optics.
  6. 10. – Can be used to measure time accurately.
  7. 12. - The only metal that is a liquid at standard room temperature, once common in thermometers.