Question

How would you assign oxidation numbers to the elements in: MnCl2, MnO4^-, MnO4^2-, MnO2

Answer 1

do you know the rules for assigning oxidation numbers?

Answer 2

No

Answer 3

ok rules are here
http://www.occc.edu/kmbailey/chem1115tutorials/oxidation_numbers.htm

Answer 4

Thank you!

Answer 5

when you read trough this you will know that oxygen has -2 oxidation state, that 7 group has -1 (F, Cl, Br...) and that oxidation numbers are written with roman numerals over elements so ill give you an example