Periodic Table

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Across
  1. 2. Symbol for atom is Ag
  2. 5. Can only form positive ions
  3. 6. We need this to live
  4. 7. The atomic weight is 12
  5. 10. Highly toxic metalloid
Down
  1. 1. Atomic mass is 14
  2. 3. This atom glows red
  3. 4. The atomic number is 12
  4. 8. The most stable nucleus
  5. 9. Elements that are somewhere between metals and non metals