physics ig

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Across
  1. 6. what color is the sky?
  2. 9. Hg as its symbol
  3. 10. when something remains unchanged
  4. 11. 2 protons and a atomic mass of 4
Down
  1. 1. 71 electrons
  2. 2. Ca as its symbol
  3. 3. 28 electrons
  4. 4. atomic mass of 223
  5. 5. 53 protons and a atomic mass of 127
  6. 7. symbol is H
  7. 8. make up everything
  8. 9. the 4th planet from the sun