Why do transition metals have multiple oxidation states?

Related questions

1. Why does manganese have the highest oxidation state?
2. Is HCl or HCLO a stronger acid?
3. Why bao2 is a peroxide but MnO2 is not?
4. Is cr2o3 acidic or basic?
5. Are dry cells actually dry?
6. What is manganese Valency?
7. What gas is produced when manganese dioxide and hydrogen peroxide are mixed?
8. What is the Valency of manganese in MnO2?
9. Why transition elements exhibit large number of oxidation states?
10. Why does an acidic character decrease down a group?

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1. #circumstances
2. #their
3. #because
4. #removed
5. #metals
6. #different
7. #electrons
8. #similar
9. #states
10. #multiple
11. #results
12. #several
13. #transition
14. #energies
15. #depending
16. #oxidation