Why d block elements have variable oxidation states?

Related questions

1. Why bao2 is a peroxide but MnO2 is not?
2. Can dry cells be recharged?
3. What does oxidation number tell you?
4. Is CrO3 an acidic oxide?
5. Why does hydrogen peroxide decompose?
6. What are dry cell batteries used for?
7. Why does basicity decrease down a group?
8. What gas is produced when manganese dioxide and hydrogen peroxide are mixed?
9. Which chemical is used in dry cell?
10. Which is better dry cell or wet cell?

Tags

1. #states
2. #variable
3. #electrons
4. #compounds
5. #result
6. #reason
7. #energy
8. #difference
9. #their
10. #formation
11. #orbitals
12. #between
13. #transition
14. #state
15. #there
16. #oxidation
17. #small
18. #elements