Roman numerals

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Lelija Kazlauskas 3J
Posts: 50
Joined: Thu Jul 11, 2019 12:16 am

Roman numerals

Postby Lelija Kazlauskas 3J » Sun Nov 24, 2019 11:21 pm

When are we supposed to use Roman numerals when naming compounds?

sarahsalama2E
Posts: 143
Joined: Fri Aug 30, 2019 12:16 am

Re: Roman numerals

Postby sarahsalama2E » Sun Nov 24, 2019 11:23 pm

When it is a transition metal, because the oxidation number can change. So, denoting the oxidation number through roman numerals and parentheses is necessary to denote exactly what compound you are talking about.

Aliya Jain 2B
Posts: 80
Joined: Wed Sep 11, 2019 12:16 am

Re: Roman numerals

Postby Aliya Jain 2B » Mon Nov 25, 2019 11:23 am

For example, Ni (I) would represent the +1 oxidation number of nickel while Ni (II) represents the +2 oxidation number

Robin Cadd 1D
Posts: 98
Joined: Thu Jul 11, 2019 12:16 am

Re: Roman numerals

Postby Robin Cadd 1D » Mon Nov 25, 2019 11:36 am

When it is common for an element to have more than one possible charge (i.e. it's common that Fe has either a charge of 2+ or 3+), Roman numerals are used. These Roman numerals help to identify the compound.

Megan_1F
Posts: 49
Joined: Thu Jul 25, 2019 12:16 am

Re: Roman numerals

Postby Megan_1F » Mon Nov 25, 2019 11:46 am

What exactly is oxidation number?

anjali41
Posts: 90
Joined: Fri Aug 09, 2019 12:15 am

Re: Roman numerals

Postby anjali41 » Mon Nov 25, 2019 11:58 am

According to the textbook, an oxidation number is "the effective charge on an atom in a compound, calculated according to a set of rules (see Toolbox K.1). An increase in oxidation number corresponds to oxidation; a decrease corresponds to reduction."

britthanul234
Posts: 51
Joined: Wed Sep 18, 2019 12:21 am

Re: Roman numerals

Postby britthanul234 » Mon Nov 25, 2019 12:24 pm

The oxidation number is the effective charge on an atom in a compound. A larger oxidation number means more oxidation while a lower oxidation number means the opposite, which is reduction.


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