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    Si

    Silicon

    Metalloid

    Atomic Number: 14 • Atomic Mass: 28.0850 u • Period: 3 • Group: 14

    Electron Configuration: 1s² 2s² 2p⁶ 3s² 3p²
    Phase: Solid
    Electronegativity: 1.9
    Aluminum (Al)Phosphorus (P)
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    Occurrence

    Silicon is found in various natural sources, including minerals, rocks, and the Earth's crust.

    • Second most abundant element in Earth's crust (28%)
    • Not found free in nature, usually as silicon dioxide or silicates
    • Present in sand, quartz, rock crystal, amethyst, agate, and flint
    • Essential element for many plants