Periodic table

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Across
  1. 1. What is the chemical symbol of Hydrochloric Acid?
  2. 2. What is the element with the chemical symbol Pb?
  3. 4. What Element is in group two and Period three?
  4. 7. How many groups are there?
  5. 9. What is Oxygens relative Atomic mass (no decimal places)?
  6. 10. What charge does an Oxygen Ion have?
Down
  1. 1. What is the first element in the Periodic Table?
  2. 3. How many bonds does carbon generally form?
  3. 5. What group is Chlorine in?
  4. 6. What is the chemical symbol for Mercury?
  5. 8. How many Periods are there?
  6. 9. How many noble gases are there?