Assigning Oxidation Numbers

2 MnO##_4## + 5 H##_2##O##_2## + 6 H ##^+## ##\longrightarrow## 5 O##_2## + 2 Mn##^{2+}## + 8 H##_2##O
Assign oxidation numbers for each of the atoms in the above net ionic equation. Identify which elements have been oxidized or reduced.