Why transition elements exhibit large number of oxidation states?

Related questions

1. Why does a basic character decrease down a group?
2. Is MnO2 acidic or basic?
3. Why does manganese have the highest oxidation state?
4. What are dry cell batteries used for?
5. What does oxidation number tell you?
6. What is the Valency of silver?
7. What happens to the oxidation number of an element during oxidation?
8. What is the Valency of manganese in MnO2?
9. Is HCl or HCLO a stronger acid?
10. What gas is produced when manganese dioxide and hydrogen peroxide are mixed?

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1. #levels
2. #because
3. #removed
4. #oxidation
5. #series
6. #other
7. #difference
8. #electrons
9. #states
10. #member
11. #variety
12. #between
13. #transition
14. #orbitals
15. #except
16. #small
17. #exhibit
18. #energy
19. #first
20. #hence
21. #metals
22. #variable