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?

  • 2
    $\begingroup$ 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.) $\endgroup$ Oct 2, 2014 at 2:12
  • $\begingroup$ @GeoffHutchison Sorry I meant the ions $\endgroup$
    – Integral
    Oct 2, 2014 at 2:16
  • $\begingroup$ @GeoffHutchison Also side question, what is more common Fe2 or Fe3? $\endgroup$
    – Integral
    Oct 2, 2014 at 2:29
  • $\begingroup$ @Thursday SiO2 isn't an ionic substance. Each individual unit is polar, though, if that's what you're asking. $\endgroup$
    – Shafter
    Oct 2, 2014 at 3:08

1 Answer 1


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. $(+4) + (+2 \times -2) = 0$


Not the answer you're looking for? Browse other questions tagged or ask your own question.