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T Shape or Trigonal Pyramidal

Posted: Wed Nov 29, 2017 10:40 am
by 104922499 1F
How can I tell the difference between trigonal pyramidal and t shape when looking at the Lewis structures?

Re: T Shape or Trigonal Pyramidal

Posted: Wed Nov 29, 2017 11:32 am
by Joshua Xian 1D
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.

Re: T Shape or Trigonal Pyramidal

Posted: Wed Nov 29, 2017 3:08 pm
by Meredith Steinberg 2E
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.

Re: T Shape or Trigonal Pyramidal

Posted: Wed Nov 29, 2017 4:26 pm
by 104922499 1F
thanks! That clears it up