chemistry element questions

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Across
  1. 2. an acid when mixed with an alkali forms a salt that ends in sulphate.
  2. 6. the element symbol is Pt.
  3. 9. which metal has the symbol Au?
  4. 11. which element has the atomic number 73?
  5. 12. which particle has a positive charge?
  6. 14. the process of removing suspended solids from a liquid.
  7. 16. what is an element made out of?
  8. 17. in which state are atoms arranged in a rigid regular tight pattern?
Down
  1. 1. what is the common name of hydrated iron oxide?
  2. 3. what is combined with carbon to make carbon monoxide?
  3. 4. what is something with a PH of 7 called?
  4. 5. The first element on the periodic table.
  5. 7. when elements are physically connected.
  6. 8. when elements are chemically connected.
  7. 10. another word for shiny.
  8. 13. what type of elements make up 3/4 of the periodic table?
  9. 15. another word for H2O.