91- 6303239042
Key rules:
1. Elements: 0 (e.g., $$Cu$$, $$O_2$$)
2. Monatomic ions: Charge (e.g., $$Cl^{-}$$ = -1)
3. Hydrogen: +1 (except hydrides: -1)
4. Oxygen: -2 (except peroxides: -1; superoxides: -½; OF₂: +2)
5. Fluorine: -1 in all compounds
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Key rules:
1. Elements: 0 (e.g., $$Cu$$, $$O_2$$)
2. Monatomic ions: Charge (e.g., $$Cl^{-}$$ = -1)
3. Hydrogen: +1 (except hydrides: -1)
4. Oxygen: -2 (except peroxides: -1; superoxides: -½; OF₂: +2)
5. Fluorine: -1 in all compounds
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