Determine the electron geometry (eg) and molecular geometry (mg) of ICI2-?

Question

And how do I learned how to figure this out!

Answer 1

To determine the electron geometry of a molecule, make a Lewis dot structure of it. It's actually pretty easy, you just put the pairs of valence electrons around the atom (they will be either covalent or unbonded pairs) and then count up the pairs around the central atom. I believe the electron geometry has to do with how many pairs are around the central atom while the molecular geometry differentiates between covalent bonds and unbonded pairs.

I'm not sure if you are referring to ICl2 or ICl2 minus. I would do the thing for you, but you would really learn more by doing it yourself. Just get the periodic table, count up the total valence electrons for the molecule (remember valence refers to electrons in the outermost shell, and every atom needs to have an octet - eight valence electrons) and then assign them through either covalent or unbonded pairs to each atom, till each atom has eight. If you are talking 2 minus, you will have to add two more electrons to the total for the molecule.

Four is tetrahedral, two is linear, 3 is either trigonal planar or pyramidal, depending on how many unbonded-and these will differ between the electron and molecular geometry. Look in your notes or book for further info.

Have fun.