gen chem help

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mhl397 said:
how do you tell the difference between trigonal pyrimidal and tetrahedral according to the VSEPR theory? thanks

Trigonal pyramidal has a lone pair--think :NH3. Tetrahedral always has four bonding groups--think CH4
 
aevea said:
Trigonal pyramidal has a lone pair--think :NH3. Tetrahedral always has four bonding groups--think CH4

Tetrahedral is electron pair geometry & molecular geomtery is trigonal pyramidal. 2 different classifications - hope this makes sense
 
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