Oxidation Number

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805097738
Posts: 180
Joined: Wed Sep 18, 2019 12:20 am

Oxidation Number

Postby 805097738 » Sun Feb 16, 2020 8:24 pm

How are we supposed to know the oxidation number for each element in a compound?

Sofia Ban
Posts: 80
Joined: Fri Sep 28, 2018 12:25 am

Re: Oxidation Number

Postby Sofia Ban » Sun Feb 16, 2020 8:39 pm

There are rules in determining the oxidation numbers and here are a few:
1)The oxidation number of a free element is always 0.
2)The oxidation number of a monatomic ion equals the charge of the ion.
3) There are some elements that already have a set oxidation number unless it is present in a compound
4)In compounds, all other atoms are assigned an oxidation number so that the sum of the oxidation numbers on all the atoms = the charge on the species.

Eva Zhao 4I
Posts: 101
Joined: Sun Sep 29, 2019 12:16 am

Re: Oxidation Number

Postby Eva Zhao 4I » Fri Feb 28, 2020 8:50 am

To add on, as a general rule, H is +1, O is generally -2 (except for peroxides), and halogens (i.e. F) are typically -1.


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