Why is it called periodic table?

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Tags

1. #category
2. #these
3. #electrons
4. #under
5. #contain
6. #arranged
7. #periods
8. #table
9. #number
10. #which
11. #elements
12. #outer
13. #periodic
14. #valence
15. #called
16. #orbitals
17. #groups
18. #their