Answer the following question:
For coordination number 4 there are 2 basic geometries, tetrahedral and square planar, and distorted versions thereof. Some main group compounds also adopt the seesaw type structure. The tetrahedral geometry is also the the main geometry for carbon with C.N. 4.
|Typically, oxoanions like permanganate (MnO4-) and other compounds with metal-oxygen or metal nitrogen multiple bonds (e.g. OsO4) have tetrahedral geometries. Another class of compounds are the halo-anions of Ni(II), Co(II), Cu(II) and Fe(II)/Fe(III).|