Tue December 18, 2012 By:

why trihalides of boron monomeric while trihalides of aluminium dimeric?

Expert Reply
Wed December 19, 2012
The size of boron atoms is small an two small boron atoms are unable to hold two big chlorine atoms like Al. If boron holds two chlorine atoms then the boron atoms will come very close to each other and will repell to get apart.
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