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What is the basic structural unit of silica in glass?

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in Food Packaging Technology by (63.0k points)
What is the basic structural unit of silica in glass?

(a) Tetrahedron

(b) Octahedron

(c) Square bipyramidal

(d) Trigonal bipyramidal

I had been asked this question in exam.

I'd like to ask this question from Glass as Packaging Material topic in division Glass Packaging Materials of Food Packaging Technology

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Correct choice is (a) Tetrahedron

For explanation: The basic structural unit is the silicon oxygen tetrahedron in which a silicon atom is tetrahedrally coordinated to four surrounding oxygen atoms. This amorphous structure, without slip planes formed by crystal boundaries that might allow deformation, is responsible for the stiffness and brittleness of glass.

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