What are the basis of Mendeleev periodic table?

Related questions

1. What is classification of elements?
2. Why is Cl more electronegative than F?
3. What is the trend in melting points across a period of elements?
4. Does Electropositivity increase across a period?
5. What are the demerits of Mendeleev's periodic table?
6. What is the trend for density on the periodic table?
7. Why is O more electronegative than N?
8. What are the trends of modern periodic table?
9. Why does atomic radius increase down a group?
10. What is Electropositivity?

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12. #masses
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14. #observed
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16. #recur
17. #classified
18. #atomic
19. #physical