The oxidation states in elements is always zero?
Yes, remember for elements the oxidation state is always 0. Unfortunately, these are rules that simply have to be learnt before they can be applied! Try using the full rules set out in textbook/revision guide/whatever in conjunction with things such as the mindmap posted above and you'll be fine
Original post by Hunarench95
A mind map I made for my Chemistry Revision. May help a little
So, if it's Ag+ then the oxidation state is +1?
Original post by Me14
So, if it's Ag+ then the oxidation state is +1?
Yep, because thats the total charge of the ion.
P4 would be 0 because it's an element.
N3- would be -3.
If this is AS level, then you'll need to be able to work out other ones, like the oxidation state of N in AgNO3
Ag=+1
O=-2x3=-6
+1-6+x=0
-5+x=0
x=+5
N3- would be -3.
If this is AS level, then you'll need to be able to work out other ones, like the oxidation state of N in AgNO3
Ag=+1
O=-2x3=-6
+1-6+x=0
-5+x=0
x=+5
Original post by x-Sophie-x
P4 would be 0 because it's an element.
N3- would be -3.
If this is AS level, then you'll need to be able to work out other ones, like the oxidation state of N in AgNO3
Ag=+1
O=-2x3=-6
+1-6+x=0
-5+x=0
x=+5
N3- would be -3.
If this is AS level, then you'll need to be able to work out other ones, like the oxidation state of N in AgNO3
Ag=+1
O=-2x3=-6
+1-6+x=0
-5+x=0
x=+5
So does the oxidation state mainly depend on the position in the periodic table? I mean besides the exceptions.
Original post by Me14
So, if it's Ag+ then the oxidation state is +1?
That's correct. You may be asked to work out the other oxidation states in a molecule. Once you know the rules, you can work them out. For example, in a molecule oxygen is normally -2,
Therefore the carbon in CO2 is going to be +4, so that the overall charge of the molecule is zero.
Another table I made for my revision. Aren't I a nice guy?
Element | Normal Oxidation Number | Exceptions |
| Group 1 | +1 | |
| Group 2 | +2 | |
| Al | +3 | |
| H | +1 | Metal Hybrides where it is -1 |
| F | -1 | |
| O | -2 | If combined with F, such as OF2 where it is +2, or in peroxides, where it is -1, eg H2O2 |
| Cl | -1 | If combined with F or O where it is positive |
| Br | -1 | If combined with F, O or Cl where it is positive |
| I | -1 | If combined with F, O, Cl, Br where it is positive |
Original post by Me14
So does the oxidation state mainly depend on the position in the periodic table? I mean besides the exceptions.
Yeah, it basically depends on the group that element is in, apart from the exceptions as you say :')
Original post by x-Sophie-x
N3- would be -3.
That depends on whether the poster meant N3- or N3-!
Original post by BJack
That depends on whether the poster meant N3- or N3-!
That's true, I didn't realise that
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