Why do transition elements show variable valency?

Related questions

1. What happens when you mix manganese dioxide and hydrogen peroxide?
2. What is an example of a wet cell?
3. Why pbcl2 is ionic and pbcl4 is covalent?
4. What is the formula for Lead II nitride?
5. Is PbCl2 soluble in water?
6. What type of catalyst is manganese dioxide?
7. Where is manganese dioxide found?
8. Is MnO2 ionic or covalent?
9. What is meant by inert pair effect?
10. Why are Zn Cd and Hg not transition elements?

Tags

1. #generally
2. #electrons
3. #transition
4. #which
5. #energy
6. #levels
7. #attributed
8. #variable
9. #orbital
10. #exhibit
11. #availability
12. #valency
13. #closer
14. #ability
15. #orbitals
16. #outermost
17. #metals