Question

Hi everyone!! I have CrO3, so the o.n. for the Cr is +6. How I find the name?? On the periodic table there are +6,+3,+2,0 for Cr

Answer 1

Ok consider that in italian we follow this rule:
min o.n ---> -oso
max o.n---> -ico (in eglish -ide I guess)
Is it the same mechanism in english?

Answer 2

And when we have more ox.numb. es. Cl we do like this:
lowest --> ipo .....-oso
middle_low--> ...-oso
middle_high-->....ico
highest---> per....-ico

Answer 3

You wouldn't find it on the periodic table, you would just say Chromium (VI) oxide.

Answer 4

Or chromium trioxide

Answer 5

which is the IUPAC name.

Answer 6

So I can't derive the name in this case?

Answer 7

*the traditional name I mean

Answer 8

What do you mean when you say "find the name" on the periodic table
Cr is simply chromium.
When bonded to oxygen, it forms a chromium oxide complex.
You can have CrO or CrO\(_2\) or CrO\(_3\)...

Answer 9

and it gives chromium various oxidation states.

Answer 10

I meant how to find the name of the molecule CrO3

Answer 11

I don't know if the italian rules are the same for english , and my problem is when we have let's say 3 ox.n and so which prefix/suffix shall we use

Answer 12

Is it that IUPAC?

Answer 13

Chemistry follows IUPAC, which are international rules followed by every scientist to avoid confusion.
This is the reason that the metric system is used in science, rather than the American or British units. It must be used so that EVERY scientists is able to understand. So yes, italy most certaintly does follow IUPAC nomencalture of molecules.

Answer 14

and crromium (VI) is stock?

Answer 15

Yes we follow IUPAC but my professon uses traditional :'D

Answer 16

What do you mean by stock?
As in a stock solution of CrO\(_3\)?

Answer 17

*professor

Answer 18

I know that when you specify the valence in brackets it's stock

Answer 19

Actually we have three way to name the molecule: iupac, traditional and stock

Answer 20

Nonetheless, as long as you follow proper naming, you should be fine.

For example, ethanol can also be named EtOH, or 1-ethanol, or ethyl alcohol, or ethylol.

Answer 21

but, I don't see wat you're asking here.

Answer 22

maybe it's different, it's hard for me to formulate the right questions....thanks the same for you're answers :)