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Chemical Principles

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(a) ClOF4- Cl has 7 electrons in its outer most shell. 5 electrons shared with the atoms around it while there is one lone pair. This means that there are a total of 6 electron domains. Therefore the shape is square pyramidal and the hybridization is sp3d2.
(b) (CH3)2TeCl2 It has 6 electrons in its outer most shell. 4 of them are shared with the molecules around it while 2 are the lone pairs. This indicates that there are a total of 5 electron domains. Therefore Te has an sp3d hybridization having the molecular shape of see-saw. And a bond angle of 90 and 120.
(c) ICl2- The ICL2- molecule has I as Iodine has Iodine as its central atom. The iodine molecule has 7 electrons, two of which have been donated to the Cl molecules satisfying their octet. The iodine has a negative charge, meaning that it also has eight electrons. 3 lone pairs and one shared with each chlorine. The total electron domains are hence 5 indicating that Iodine has an sp3d hybridization. The shape hence becomes linear with the angle approximately equal to 180o.
NOTE: Some of the answers to this section REQUIRE structural formulae drawn in Symyx Draw (freeware available from the Accelrys website). There is a tutorial in the Organic folder of the Chemical Principles module in Blackboard to assist in learning how to use Symyx