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What is the charge of Silicon dioxide ions? I can't find it anywhere.

It seems to be 0?

Also is there anywhere I can find these on my own?

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    $\begingroup$ I'm not even sure what the question is. Usually one talks about a formal charge on a particular atom. Worse, $\ce{SiO2}$ isn't an isolated molecule - it's a network solid. (Actually, it's many types of network solids.) $\endgroup$ – Geoff Hutchison Oct 2 '14 at 2:12
  • $\begingroup$ @GeoffHutchison Sorry I meant the ions $\endgroup$ – Integral Oct 2 '14 at 2:16
  • $\begingroup$ @GeoffHutchison Also side question, what is more common Fe2 or Fe3? $\endgroup$ – Integral Oct 2 '14 at 2:29
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    $\begingroup$ Please try to ask separate questions as separate questions, not in the comments. $\endgroup$ – Geoff Hutchison Oct 2 '14 at 2:46
  • $\begingroup$ @Thursday SiO2 isn't an ionic substance. Each individual unit is polar, though, if that's what you're asking. $\endgroup$ – Shafter Oct 2 '14 at 3:08
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Like what @GeoffHutchison said,

$\ce{SiO2}$ is not an ion. It is a network solid. Its net charge is zero.

From charge balance, since oxygen holds a -2 formal charge, then silicon must hold a +4 formal charge in order to balance out. $(+4) + (+2 \times -2) = 0$

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