Chemistry

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Across
  1. 3. Are also called energy levels
  2. 5. the revolving path traced by electrons
  3. 6. atomic number is six
  4. 7. modern periodic law
  5. 9. noble gases are also called as ----- gases
Down
  1. 1. elements from group 3 to 12 are-------- metals
  2. 2. proposed atomic theory
  3. 4. element which have no neutron
  4. 8. valence electons of noble gases