How to Find Oxidation Number (Step-by-Step)#shorts #viral #examstrategy #chemistry #study #youtube

How to Find Oxidation Number (Step-by-Step)
To find the oxidation number of an atom in a compound or ion, follow these simple rules in order:
Free element → Oxidation number = 0
(H₂, O₂, Na, Cl₂)
Monoatomic ion → Oxidation number = charge of ion
(Na⁺ = +1, Cl⁻ = −1)
Hydrogen (H) → +1 (except in metal hydrides, where it is −1)
Oxygen (O) → −2 (except in peroxides −1, and with fluorine +2)
Group 1 metals → +1
Group 2 metals → +2
Fluorine (F) → Always −1
Sum rule →
Neutral compound → sum of oxidation numbers = 0
Polyatomic ion → sum = charge o
f ion
📌 Example:
Find oxidation number of S in H₂SO₄
H = +1 (×2 = +2)
O = −2 (×4 = −8)
Total = 0
S = +6
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