The periodic crossword

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Across
  1. 2. What do you do to a wrinkled shirt
  2. 6. Main element in water
  3. 8. A sinking ship
  4. 9. A prize element
  5. 11. Discovered radioactivity
Down
  1. 1. A very smart person
  2. 3. Colourful sunscreen
  3. 4. Bananas have a lot
  4. 5. The 1st person in a race has a big ____
  5. 7. what we breath
  6. 10. Some people think maths is _____