Question

# What is total negative charge on the silicate [Si4O11]?

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Solution

## Four Si atoms have total charge 4(+4)=+16. 11 oxygen atoms have total charge 11(−2)=−22. Hence, total negative charge =16−22=−6 The total negative charge on the silicate [Si4O11] is 6. It is a double chain type of silicate in which total 2.5 oxygen atoms are shared. An example is Tremolite (Asbestos) Ca2Mg5(OH)2(Si4O11)2.

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