Oxidation and Reduction!. Aka: Redox. Oxidation and Reduction is the concept that helps us understand how/why elements gain/ lose electrons An important Mnemonic is: LEO says GER Lose electrons= oxidation, Gain electrons = Reduction ( OilRig …) idonlike.
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Oxidation and Reduction is the concept that helps us understand how/why elements gain/ lose electrons
1 - oxidation state of a free ( single) element (or diatomic molecule) is 0 Na0, Fe0, N20, etc.
2 - oxidation number of a monatomic cation is same as its charge ( group 1, 2 metals in particular!) +1, +2
3 – normal oxidation number of Hydrogen is +1
but… H -1 in metal hydrides NaH, MgH2,
Na2O, MgO, H2O, Na2O2, MgO2,H2O2,
5 – a lot of elements- especially transition metals and most of the non metals can have lots o’ different oxidation numbers
And that sounds fascinating … doesn’t it? (yes!)
*The sum of all oxidation numbers in a compound will = 0 , kinda like what we have been doing with ionic compounds ( examples!)
And : NO, NO2,N2O5, etc….
The sum of all oxidation numbers in a polyatomic ion will be the charge of the P.A. ion
Some, like transition metal ionic compounds you can do!
Molecular compounds we have to figure out, based on rules. ( examples…)
Polyatomic ions… we have to figure out based on rules… (examples)