Oxidation numbers
charge 0
Try: · · · · ·
K+1Mn+7O4−2
(+1) + (+7) + 4×(−2) = 0 ✓
Rules applied, in order
| K | group 1, always +1 | +1 | fixed |
|---|---|---|---|
| O | oxygen, −2 unless a peroxide | −2 | fixed |
| Mn | deduced from the sum | +7 | deduced |
Try: · · · · ·
(+1) + (+7) + 4×(−2) = 0 ✓
Rules applied, in order
| K | group 1, always +1 | +1 | fixed |
|---|---|---|---|
| O | oxygen, −2 unless a peroxide | −2 | fixed |
| Mn | deduced from the sum | +7 | deduced |