Pure elements

Definition & Classification

Pure Elements are substances composed of only one type of atom, existing in:

Free (Native) State: Naturally uncombined (e.g., gold nuggets, diamond)Allotropes: Different structural forms (e.g., graphite vs. diamond for carbon)

Key Feature:

Defined by atomic number (proton count) on the periodic table.

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Forms of Pure Elements

Category	Description	Examples
Metals	Conductive, malleable	Gold (Au), Iron (Fe), Aluminum (Al)
Nonmetals	Brittle, insulators	Sulfur (S), Oxygen (O₂), Iodine (I₂)
Metalloids	Semi-conductive	Silicon (Si), Boron (B)

Allotrope Examples:

Carbon: Graphite (conductive), Diamond (hardest natural material)Phosphorus: White (toxic), Red (stable), Black (semiconductor)

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Key Properties

Property	Metals	Nonmetals
State at RT	Mostly solid (except Hg)	Gas (O₂), Solid (S), Liquid (Br₂)
Conductivity	High (heat/electricity)	Low (except graphite)
Reactivity	Varies (Na reactive, Au inert)	High (Cl₂), Low (N₂)

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Industrial Applications

Element	Use Case	Industry
Silicon	Semiconductor chips	Electronics
Gold	PCB coatings, jewelry	Electronics/Luxury
Sulfur	Vulcanizing rubber	Automotive
Oxygen	Medical gas, steelmaking	Healthcare/Metallurgy

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Extraction & Purification

Method	Target Elements	Process Example
Electrolysis	Aluminum (Al), Chlorine (Cl₂)	Hall-Héroult process (Al₂O₃ → Al)
Smelting	Iron (Fe), Copper (Cu)	Blast furnace (Fe₂O₃ → Fe)
Distillation	Zinc (Zn), Mercury (Hg)	Retort processing (ZnO → Zn)

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Safety & Storage

Metals:Store in dry conditions (prevent oxidation, e.g., Na in oil)Nonmetals:Gas cylinders (O₂, N₂) with pressure regulatorsToxic solids (e.g., white P) under water/inert gas

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