Science crossword

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Across
  1. 1. the only halogen liquid at room temperature
  2. 4. roughly how many elements are there on the periodic table
  3. 6. the extremely large stars in the universe are known as these
  4. 8. a magnetic metal beginning with the letter N
  5. 9. when a liquid is neither acid or alkali
  6. 12. What colour is neon when electricity passes through
  7. 13. The most common matter in the universe
  8. 14. what food item has the chemical equation NaCl
  9. 16. what type of rock forms when magma cools and crystalizes
  10. 17. to prevent metals from reacting with oxygen what are they kept in
  11. 18. the highest element on the reactivity scale
Down
  1. 2. what is the name for a metal that reacts with oxygen
  2. 3. you use this object to separate iron filings from sand
  3. 5. Also known as quicksilver
  4. 7. there are as many of these in a particle as there are protons
  5. 10. Your stomach contains these to break down food
  6. 11. Number twelve on the periodic table
  7. 15. how many elements are liquids at room temperature
  8. 16. what metal makes up 80% of the earths core