Crossword puzzle: Periodic elements

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Across
  1. 2. "Brass component" or "Alloyed with copper to make brass".
  2. 4. Element that reacts with iron to form rust
  3. 6. "Key component of heat-resistant Pyrex glass.
  4. 8. this element is good for your bones
  5. 9. This element is in pencils
  6. 10. This element is the lightest element on the periodic table
  7. 12. Lightweight metal used in aerospace and third most abundant element in Earth's crust.
  8. 14. This noble gas is the third-most abundant gas in Earth's atmosphere, making up about 0.93% of the air"
  9. 15. element powering electric cars and smartphones
  10. 16. this element is the most abundant element in earths atmosphere making up about 78% of the atmosphere by volume
  11. 17. element" or "Toothpaste additive
  12. 19. radioactive alkali metal found at the very bottom of the first column"
  13. 20. element is the sixth most abundant metal in the earths crust
Down
  1. 1. Burns with a blindingly brilliant white light.
  2. 3. Primary ingredient for glassmaking and Major component of beach san
  3. 5. It is the lightest structural metal and burns with a brilliant white light.
  4. 6. noble gas often found in glowing signs
  5. 7. natural substance in the world
  6. 8. lustrous, silvery-white metal, the most common element on Earth by mass, forming much of the planet's core.
  7. 10. Element used to disinfect swimming pools
  8. 11. Element often called brimstone . And Matchstick tip component".
  9. 12. found in DNA
  10. 13. mineral found in bananas
  11. 18. This element is in pencils This element has the lowest boiling point on the periodic table