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Topic: Anion, Cation, or Molecule?  (Read 6918 times)

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Offline artem.metelskiy

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Anion, Cation, or Molecule?
« on: February 18, 2011, 08:08:53 PM »
I don't know how to determine the answer for the next question:
Does the following Lewis structure represent an anion, a cation, or a molecule? If it represents an ion, what is the charge on the ion?

Help me to approach the answer.
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Offline opti384

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Re: Anion, Cation, or Molecule?
« Reply #1 on: February 18, 2011, 08:19:51 PM »
Keep in mind that ions have less or more electrons than the neutral state.
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Offline artem.metelskiy

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Re: Anion, Cation, or Molecule?
« Reply #2 on: February 18, 2011, 10:49:03 PM »
So neutral state would be S(1x6)+O(3x6)=24 but the structure has 26 e-, means 2 extra. Would the answer be "Molecule [SO3]-2?
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Offline rabolisk

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Re: Anion, Cation, or Molecule?
« Reply #3 on: February 18, 2011, 10:49:45 PM »
Yes, also known as sulfate.
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Offline sjb

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Re: Anion, Cation, or Molecule?
« Reply #4 on: February 19, 2011, 08:00:33 AM »
Quote from: rabolisk on February 18, 2011, 10:49:45 PM
Yes, also known as sulfate.

Either sulfate(IV), or sulfite, surely? (sulfate has 4 oxygens)
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Offline rabolisk

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Re: Anion, Cation, or Molecule?
« Reply #5 on: February 19, 2011, 02:05:54 PM »
Meant to say sulfite, my apologies.
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