why dows alcl3 form dimer?
Answers
Answered by
0
AlCl3 has a trigonal planar structure. There is an aluminium atom with 3 sp2 hybridised
orbitals which bond to 3 chlorine atoms. The bond angle is 120 degrees.
Each chlorine atom shares 1 electron with aluminium in the chemical
bond in order to complete it's valence shell. Aluminium has 3 valence
electrons and gets 3 more by sharing one with each of the 3 chlorine
atoms which brings its total valence electron count to 6 electrons. In
order to complete its electron shell aluminium requires 2 more
electrons. Chlorine has 6 electrons which aren't involved in bonding
which form 3 non bonding pairs. In order to complete aluminium's valence
electron shell two AlCl3 molecules dimerise. A chlorine atom from each
of the two molecules forms a dative covalent bond with one of its lone
electron pairs to the aluminium centre making the molecule Al2Cl6
Similar questions