what is its crystal structure?
Crystallises in a giant covalent structure at standard conditions, specifically in a diamond cubic lattice.
Silicon
Silicon crystallises in a giant covalent structure at standard conditions, specifically in a diamond cubic lattice. It thus has a high melting point of 1414 °C, as a lot of energy is required to break the strong covalent bonds and melt the solid.
what is earth? Third planet from the Sun what is its shape? Nearly spherical when did its formation start? Ga ago what is its chemical composition? Iron, oxygen, silicon, magnesium, sulphur, nickel, calcium, and aluminum, and trace amounts of other elements. when was the third mentioned composition discovered? 1787
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Silicon [SEP] Crystal structure
Silicon crystallises in a giant covalent structure at standard conditions, specifically in a diamond cubic lattice. It thus has a high melting point of 1414 °C, as a lot of energy is required to break the strong covalent bonds and melt the solid. It is not known to have any allotropes at standard pressure, but several other crystal structures are known at higher pressures. The general trend is one of increasing coordination number with pressure, culminating in a hexagonal close-packed allotrope at about 40 gigapascals known as Si–VII (the standard modification being Si–I). Silicon boils at 3265 °C: this, while high, is still lower than the temperature at which its lighter congener carbon sublimes (3642 °C) and silicon similarly has a lower heat of vaporisation than carbon, consistent with the fact that the Si–Si bond is weaker than the C–C bond.