Four. Ammonia (NH3) is an example.
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Carbon has four Hydrogen atoms around it.It is in tetrahedral shape
Silicon Tetrafluoride has a tetrahedral molecular geometry. That means there are 4 F atoms around the central atom Si.
C2H4Cl2 (dichloroethane) has tetrahedral geometry around both carbon atoms. The geometry can be changed from free rotation to restricted rotation which has the formula of C2H2Cl2.
Trigonal pyramidal. As has 5 valence electrons. It forms single bonds with each of the F atoms, donating one electron to each bond. This leaves 2 unbonded electrons, or a single lone pair. Thus the molecule has 4 different groups attached to As, and the electron configuration is tetrahedral. A tetrahedral configuration with one lone pair results in a trigonal pyramidal molecular geometry.
CdCl4 2- has a tetrahedral molecular geometry. Two of the Cl atoms form normal single bonds with Cd and the other two share 2 of their electrons with the empty p-orbital on Cd.