Molecules with Electrons Oriented in Four Directions

Four pairs of electrons will orient themselves at about 109 degrees (in three dimensional space).  If there are lone pairs, they exert an influence but are not seen in the molecular geometry.  Click on the image and drag to rotate the molecules.

What do you think happens to the bond angles between adjacent atoms when lone pairs are present?

Methane    CH4 Ammonia    NH3 Water    H2O
tetrahedral trigonal pyramidal angular or bent

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