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Topic: elements with more than one charge.  (Read 15367 times)

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Offline blackcape

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elements with more than one charge.
« on: February 24, 2009, 01:35:22 AM »
Was looking for some examples of elements that form ions with MORE than 1 charge.  I know a couple that have just one, but cannot for the life of me think of some elements with more than one charge.  Such as -3 and -4 or +4 and +6.

Thanks...
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Offline macman104

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Re: elements with more than one charge.
« Reply #1 on: February 24, 2009, 01:43:01 AM »
Can they be polyatomic, or just single element ions?

Any of the second column metals will form +2 ions.
Aluminum can be a +3.
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Offline Astrokel

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Re: elements with more than one charge.
« Reply #2 on: February 24, 2009, 02:07:26 AM »
Alot of elements(non-metal and transition elements) has more than 1 oxidation states. For example, -Cl when bonded.
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Offline Mitch

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Re: elements with more than one charge.
« Reply #3 on: February 24, 2009, 02:52:25 AM »
Titanium, hafnium, zirconium, thorium, uranium, plutonium, rutherfordium are commonly found as +4.
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Offline Borek

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Re: elements with more than one charge.
« Reply #4 on: February 24, 2009, 03:16:21 AM »
Quote from: Mitch on February 24, 2009, 02:52:25 AM
Titanium, hafnium, zirconium, thorium, uranium, plutonium, rutherfordium are commonly found as +4.

That all counts as one :)
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Offline cliverlong

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Re: elements with more than one charge.
« Reply #5 on: February 24, 2009, 06:35:31 AM »
Quote from: blackcape on February 24, 2009, 01:35:22 AM
Was looking for some examples of elements that form ions with MORE than 1 charge.  I know a couple that have just one, but cannot for the life of me think of some elements with more than one charge.  Such as -3 and -4 or +4 and +6.

Thanks...
http://www.webchem.net/notes/A2/tp/tm_ox_states.htm
http://www.chemguide.co.uk/inorganic/group4/oxstates.html
http://www.chemguide.co.uk/inorganic/redox/oxidnstates.html

Clive
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Offline macman104

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Re: elements with more than one charge.
« Reply #6 on: February 24, 2009, 11:09:48 AM »
Oxidation states are not formal charges though, right?  I read the question as asking "what are charges that ions can have in a solution or some media".  The question is a little unclear.
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Offline syd

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Re: elements with more than one charge.
« Reply #7 on: February 24, 2009, 11:21:16 AM »
I think he means something like how Fe atoms can be +2 or +3 ions.. in different compounds.  Copper is the same, +2 or +3 I'm going off memory.. I think Pb can be +2 or +4 and afaik you just have to remember it.  I don't know the entire list
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Offline typhoon2028

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Re: elements with more than one charge.
« Reply #8 on: February 24, 2009, 11:25:03 AM »
Chromium is a common element with different oxidation states. 

trivalent chromium (Chromium III)  +3
hexavalent chromium (Chromium VI) +6

Chromium is a good example of how oxidation state changes the properties of chemical.  Trivalent chromium is used to make green pigments and is a essential mineral for the human body.  Hexavalent chromium compounds are toxic.

This example is used in the movie "Erin Brockovich."
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Offline blackcape

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Re: elements with more than one charge.
« Reply #9 on: February 24, 2009, 05:29:21 PM »
oh cool.  This helps more than you know. 
Thanks!
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