Elements and its properties

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Across
  1. 4. most common chemical
  2. 6. columns in the periodic table
  3. 8. symbol is O.
  4. 9. rarest chemical element with symbol At
  5. 10. rows in the periodic table
  6. 12. electronic configuration 2,8,2
Down
  1. 1. symbol K
  2. 2. a radioactive gas
  3. 3. most reactive of all non-metal.
  4. 5. 78% of the earth's atmosphere is
  5. 7. atomic number is 32
  6. 11. Na