Group work

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Across
  1. 2. it's in the fourth group and period five
  2. 5. it's atomic number is 12
  3. 8. atomic number:42 and it's mass number is 96
  4. 10. it's mass number is 89
Down
  1. 1. it's atomic number is 104
  2. 3. it's in the first group and period four
  3. 4. it's mass number is 178
  4. 6. it's mass number is 11
  5. 7. it's below argon
  6. 9. all living things need this