What is periods and groups in periodic table?

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Tags

  1. #periodic
  2. #period
  3. #number
  4. #categorizing
  5. #elements
  6. #table
  7. #while
  8. #across
  9. #increases
  10. #horizontal
  11. #columns
  12. #groups
  13. #group
  14. #periods
  15. #vertical
  16. #atomic