Question

Please let me know what the difference between `"Fe"^(+2)` and `"Fe"^(2+)`, I mean `+2` valency or `2+` valency ??

Answer 1

Here's my take on this.

Explanation:

As far as I know, charge is written using the value first and the sign second and oxidation state is written using the sign first and the value second.

So, for example, the net charge of your cation is written

`"Fe"^(2+)" "` not `" " "Fe"^(+2)`

In this example, you would say that the iron atom has a `+2` oxidation state. For atoms that can form multiple ions, the oxidation state is added to the name of the cation using Roman numerals.

Therefore, you can say that iron is in the `+2` oxidation state in the iron(II) cation, `"Fe"^(2+)`.

Keep in mind that the oxidation state of a monoatomic ion is equal to its net charge, but that the notation used is different for the two

`stackrel(color(blue)(+2))("Fe")""^(2+) ->` an iron(II) cation that has a net charge of `2+` and an oxidation state of `color(blue)(+2)`