Roman numerals next to element

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juliasloan_4g
Posts: 67
Joined: Fri Sep 28, 2018 12:28 am

Roman numerals next to element

Postby juliasloan_4g » Sun Oct 28, 2018 11:12 pm

What do roman numerals next to an elements name mean? Ex: in 2A.23 indium(III) sulfide

Meghanhe1l
Posts: 60
Joined: Fri Sep 28, 2018 12:17 am

Re: Roman numerals next to element

Postby Meghanhe1l » Sun Oct 28, 2018 11:15 pm

The roman numerals specify the atom's ionic form for the atoms that can gain/lose differing number of electrons.

Ivan Tadeja 4B
Posts: 31
Joined: Fri Sep 28, 2018 12:28 am

Re: Roman numerals next to element

Postby Ivan Tadeja 4B » Sun Oct 28, 2018 11:35 pm

The roman numeral proceeding the element name represents the charge of the element.

705192887
Posts: 77
Joined: Fri Sep 28, 2018 12:18 am

Re: Roman numerals next to element

Postby 705192887 » Sun Oct 28, 2018 11:45 pm

The roman numeral signifies what the charge on that atom is. For example, depending on what Iron or another element is bonded to, it could be Iron II or Iron III to balance the charges. Hope this helps! #sickomode

ElliotPourdavoud 1A
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Joined: Fri Sep 28, 2018 12:16 am

Re: Roman numerals next to element

Postby ElliotPourdavoud 1A » Sun Oct 28, 2018 11:47 pm

It signifies the charge of that atom as some elements have different ion forms.
Last edited by ElliotPourdavoud 1A on Sun Oct 28, 2018 11:48 pm, edited 1 time in total.

Arshia Ramesh 1G
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Joined: Fri Sep 28, 2018 12:18 am

Re: Roman numerals next to element

Postby Arshia Ramesh 1G » Sun Oct 28, 2018 11:47 pm

It means the charge of the element!

Ashley Kim
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Re: Roman numerals next to element

Postby Ashley Kim » Sun Oct 28, 2018 11:58 pm

It's important to note that some transition metals are capable of having multiple charges, hence the need for the Roman numerals in the first place. Transition metal ions involve a rearrangement of both the d and s orbitals. This is because according to the Aufbau principle, the electrons fill the 4s shell before the 3d shell, etc.

Catly Do 2E
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Joined: Fri Sep 28, 2018 12:24 am

Re: Roman numerals next to element

Postby Catly Do 2E » Mon Oct 29, 2018 2:42 am

The use of Roman numerals in chemical nomenclature is to indicate the charge of the ion. Usually, the transitional metal has multiple possible ion charges. For example, Fe (II) stands for Fe2+ and Fe (III) stands for Fe3+; the charge changes according to the number of electrons on the atom.

Jessica Dharmawan 1G
Posts: 32
Joined: Fri Sep 28, 2018 12:15 am

Re: Roman numerals next to element

Postby Jessica Dharmawan 1G » Mon Oct 29, 2018 9:26 am

Roman numerals are used to name the different ions of the transition metals. An example would be: Cu3+ named as Cu(III).


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