C1a crossword starter

1234567891011121314151617181920
Across
  1. 4. A row in the periodic table is called a ___________.
  2. 10. The common name for calcium carbonate.
  3. 11. These are made up of only one type of atom.
  4. 12. Two or more different elements joined together.
  5. 14. The process of separating metals using electricity.
  6. 16. If metals are not reused this is where they will end up.
  7. 17. Most metals are found in the ground as an ________.
  8. 18. The number of electrons that can fit in the 3rd shell.
  9. 19. Most iron is converted to this to make it more useful.
  10. 20. A limestone quarry would provide this for local people.
Down
  1. 1. This metal is used to make wires due to its conductivity.
  2. 2. This metal is used to make aircraft due to its properties.
  3. 3. A column in the periodic table is called a _________.
  4. 5. A more reactive metal replaces a less reactive metal in this type of reaction.
  5. 6. A mixture of a metal with one or more elements is known as an ________.
  6. 7. This metal is an example of a native metal.
  7. 8. One way of reducing the amount of metal we have to extract.
  8. 9. The reaction to break down limestone is called thermal _________.
  9. 13. The part of the atom where protons & neutrons are found.
  10. 15. This element has an electron configuration of 2,8,7.