CHEM Wizards! I need ur help! PLEASE!

Question

What is the oxidation number of manganese in the following:

1. Manganese (II) Hydroxide

2. Manganese (III) Hydroxide

3. Manganese Dioxide

4. Permanganate ion

5. Manganate ion

PLS. HELP!

i'd really appreciate it.

thanks!!!

Answer 1

firstly you need to put these into their chemical formulae which overall has to equal 0

Use the oxygen to calculate the oxidation number of manganese.  Each oxygen atom is -2. Generally each hydrogen atom is +1.

1 = Mn(OH)2

2 oxygen atoms make -4

2 hydrogen atoms make +2

that leaves you with -2 so to make the compound 0 you have to +2 and that is the oxidation number of manganese. I would do the others but i cant bothered and you'll never learn so good luck =D