The silicate anion in the mineral kinoite is | vedclass

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(B) The silicate anion consists of three $SiO_4$ tetrahedra linked in a chain.Each $SiO_4$ unit has a charge of $-4$.In a chain of $n$ tetrahedra,the

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$-8$

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(B) The silicate anion consists of three $SiO_4$ tetrahedra linked in a chain.Each $SiO_4$ unit has a charge of $-4$.In a chain of $n$ tetrahedra,the number of shared oxygen atoms is $(n-1)$.For $n = 3$,the number of shared oxygen atoms is $3 - 1 = 2$.Each shared oxygen atom reduces the total negative charge by $1$ unit (since it is shared between two $Si$ atoms,effectively contributing $-1$ charge to each $SiO_4$ unit instead of $-2$).Alternatively,the formula for a linear chain of $n$ tetrahedra is $[Si_nO_{3n+1}]^{(2n+2)-}$.For $n = 3$,the formula is $[Si_3O_{3(3)+1}]^{(2(3)+2)-} = [Si_3O_{10}]^{8-}$.Thus,the charge of the silicate anion is $-8$.

The silicate anion in the mineral kinoite is a chain of three $SiO_4$ tetrahedra,that share corners with adjacent tetrahedra. The charge of the silicate anion is

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