Oxidation State Rules Flashcards
1
Q
Oxidation number of atoms (not in molecules, not ions)
A
Equal to zero
2
Q
Oxidation number of ion
A
Same as charge of ion (there are exceptions though)
3
Q
Fluorine in a compound
A
always has oxidation number of -1
4
Q
Chlorine is usually -1 except…
A
except when with oxygen e.g in ClO-
the Cl= +1
5
Q
Combined oxygen has oxygen number of -2 except…
A
In a peroxide (-1) or with flourine (+2)
6
Q
Combined hydrogen is +1 except…
A
except in a metal hydrides where H is -1
7
Q
metals always have
A
positive oxidation numbers
8
Q
Sum of oxidation numbers in a molecule (no charge) is…
A
0
9
Q
Sum of the oxidation numbers in polyatomic ion is…
A
same number as the charge of that polyatomic ion.
