Species Number of oxygen atoms shared by ${SiO}_{4}^{- 4}$ tetrahedra
orthosilicate( ${SiO}_{4}^{- 4}$ ) P
pyrosilicate( ${Si}_{2} O_{7}^{- 6}$ ) Q
Chain silicate( ${SiO}_{3}^{- 2})_{n}$ R
2 -dimensional sheet structure ${({Si}_{2} O_{5}^{- 2})}_{n}$ S
Sum of P + Q + R + S is -------------------------------------------

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Detailed Solution

Species	Number of oxygen atoms shared
orthosilicate	0
Pyrosilicate	1
Chain silicate	2
2-dimensional sheet structure	3

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Species	Number of oxygen atoms shared by ${SiO}_{4}^{- 4}$ tetrahedra
orthosilicate( ${SiO}_{4}^{- 4}$ )	P
pyrosilicate( ${Si}_{2} O_{7}^{- 6}$ )	Q
Chain silicate( ${SiO}_{3}^{- 2})_{n}$	R
2 -dimensional sheet structure ${({Si}_{2} O_{5}^{- 2})}_{n}$	S