(SiF6)2- is known whereas (SiCl6)2- is not why??

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Solution

Dear Student, In SiCl6(2-) the chlorine atom is much larger than flourine [of (SiF6)2 ] 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. Regards

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