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VSEPR Theorum

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oilypiggy:
Hi Guys, can anyone help with this question?
Using the VSEPR model, the electron-domain geometry of the central atom in NO2- is _______
a) Linear
b)Trigonal Planar
c) Tetrahedral
d)Trigonal Bipyramidal
e)Octahedral

Thanks!

sjb:
What are your thoughts? How many electron pairs are there around the central atom?

ChargePositive:
Are you able to draw out Lewis structure for the molecule? If you are, classifying the shape is easy, and goes by the number of lone pairs of electrons and bonded pairs of electrons. You can always look up a VSEPR Chart that tells you what shape the molecule will be based on the electron pairs.

oilypiggy:
I'm unsure of its 3 or 4 as i dont knwo if the double bond counts

AWK:
both wrong
You must draw the Lewis structure correctly. Double or triple bonds in the Lewis structure count as "one pair" of electrons for the purpose of establishing the electron pair geometry.

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