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physical properties of non metallic materials
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discuss the physical properties of non-metals
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metallic and nonmetallic properties
physical properties of non metallic materials, physical properties of non metal, physical properties of metal and non metals, physical properties of nonmetals, discuss the physical properties of non-metals, typical properties of non metals, metals and non metals physical properties, properties of non metal, general physical properties of nonmetals, physical properties of metals and nonmetals, metallic and nonmetallic properties
