(sif6)2- is known whereas (sicl6)2- not . Give possible reason

1.	(sif6)2- is known whereas (sicl6)2- not . Give possible reason
Answer» in SiCl6(2-) the chlorine atom is much larger than flourine which does not allow the six chlorines to surround the silicon due to repulsions between chlorine atoms. silicon cannot acomodate 6 chlorines around it.Hence , due to interelectron repulsions between chlorine atoms the compound SiCl6(2-) is unstable and not known.

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