Periodic table

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Across
  1. 3. Which element is in a toothpaste?
  2. 5. metal Which type of metal is Iron?
  3. 8. What are the horizontal rows of the periodic table called?
  4. 9. Who created the periodic table?
Down
  1. 1. What is more reactive than carbon,but less reactive than Magnesium
  2. 2. Which element can be found in both gas and liquid forms?
  3. 4. Element 82 is ___ reactive than element 50.
  4. 5. How many Isotopes does hydrogen have?
  5. 6. What is the name of the full-shelled elements?
  6. 7. The lightest element is __