Roman Numerals

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Beatrice Petelo 1F
Posts: 62
Joined: Fri Sep 28, 2018 12:17 am

Roman Numerals

Postby Beatrice Petelo 1F » Tue Dec 04, 2018 1:32 am

How do we know when to include roman numerals when naming?

Arshiya
Posts: 69
Joined: Fri Sep 28, 2018 12:16 am
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Re: Roman Numerals

Postby Arshiya » Tue Dec 04, 2018 10:56 am

The transition metals must have roman numerals that match the ion charge.

Fayez Kanj
Posts: 62
Joined: Fri Sep 28, 2018 12:18 am
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Re: Roman Numerals

Postby Fayez Kanj » Tue Dec 04, 2018 11:07 am

Hi!

Roman numerals indicate the oxidation state of the transition metal in the coordination compound (inside the [square brackets]). If the oxidation state is +1, then use (I), if +2, use (II) and so on.

Hope this helps :)

Parth Mungra
Posts: 72
Joined: Fri Sep 28, 2018 12:28 am

Re: Roman Numerals

Postby Parth Mungra » Tue Dec 04, 2018 11:44 am

You have to look at the charges and the amount of atoms/molecules inside the coordination compound as well as outside. If there is a Cl3, then the entire molecule has a -3 charge. Look at the others and then fill out the charge for the transition metal. That should be your last step. Make sure the charges cancel if there is no overall charge on the compound as a whole.


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