T Shape or Trigonal Pyramidal

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104922499 1F
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T Shape or Trigonal Pyramidal

Postby 104922499 1F » Wed Nov 29, 2017 10:40 am

How can I tell the difference between trigonal pyramidal and t shape when looking at the Lewis structures?

Joshua Xian 1D
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Re: T Shape or Trigonal Pyramidal

Postby Joshua Xian 1D » Wed Nov 29, 2017 11:32 am

Trigonal pyramidal occurs when tetrahedral electronic geometry has a lone e- pair as one of its four regions of e- density. T shape occurs when a trigonal bipyramidal electronic geometry has lone e- pairs as two of its five regions of e- density or when an octahedral electronic geometry has lone e- pairs as three of its six regions of e- density.

Meredith Steinberg 2E
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Re: T Shape or Trigonal Pyramidal

Postby Meredith Steinberg 2E » Wed Nov 29, 2017 3:08 pm

T shape structures have the VSEPR formula AX3E2, which means there are 2 lone pairs on the central atom. Trigonal pyramidal structures have the VSEPR formula AX3E, which means there's one lone pair on the central atom.

104922499 1F
Posts: 53
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Re: T Shape or Trigonal Pyramidal

Postby 104922499 1F » Wed Nov 29, 2017 4:26 pm

thanks! That clears it up


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