What are the key features of Mendeleev's periodic table?

Related questions

1. Why does Electropositivity increase down a group?
2. Why is O more electronegative than N?
3. Why does atomic radius increase down a group?
4. Does boiling point increase across a period?
5. Which is more electronegative C or H?
6. What are the uses of periodic table?
7. What is the trend in melting points across a period of elements?
8. What is the trend in electronegativity from left to right across a period?
9. What is the trend for density on the periodic table?
10. Why do boiling points increase down Group 0?

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1. #atomic
2. #mendeleev
3. #features
4. #known
5. #groups
6. #masses
7. #order
8. #called
9. #vertical
10. #table
11. #their
12. #arranged
13. #horizontal
14. #contained
15. #eight
16. #similar
17. #periodic
18. #there
19. #increasing
20. #elements
21. #column
22. #properties
23. #periods