It depends on the phase and the temperature
Solid AlCl3 has each aluminium is 6 coordinate, surrounded by 6 chlorine atoms in an octahedral formation. The best description here is a ionic bonding. Interestingly just below melt temperature the conductivity rises indicating free ions.
AlCl3 in the melt is found as dimer Al2Cl6 with four coordinate aluminium. Two chlorines bridging the aluminium atoms. In this aluminium achieves its octet and the bond angles are in line with VSEPR theory.
At high temperature the dimers dissociate to monomeric AlCl3 which is trigonal planar, following VSEPR theory.
trigonal planar
Trigonal Planar
Trigonal Pyramidal. It is not trigonal planar because there is one lone pair around the central atom, just like the shape of ammonia.
Trigonal Planar.
Trigonal Planar
trigonal planar
Trigonal Planar
Not linear.
CO32- is trigonal planar, bond angles are 1200
nh3
Sulfur tetraoxide is a trigonal planar. There is the sulfur in the middle and three oxygen that surrounds it with all of them a double bond linking them to the sulfur.
For a truly trigonal planar molecule the bond angles are 120 0 exactly.
nh3
Trigonal planar
The molecular geometry of BF3 is trigonal planar. It has three bond pairs and no lone pairs, resulting in a planar triangular shape. The bond angle between the three fluorine atoms is approximately 120 degrees.
Trigonal Pyramidal. It is not trigonal planar because there is one lone pair around the central atom, just like the shape of ammonia.
The molecule H2CO, formaldehyde, has a trigonal planar molecular shape with a bond angle of 120 degrees. It is a polar molecule due to the difference in electronegativity between carbon and oxygen, resulting in a net dipole moment.