Metals, Non-Metals & Alloys
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Mastering Metals, Non-Metals & Alloys is essential for high-fidelity technical architecture and senior engineering roles in 2026.
Chemistry Decoder: The World of Elements
Phase 1: The Foundation (What is a Metal?)
Metals are the "Givers" (they love losing electrons) and Non-metals are the "Takers" (they love gaining electrons).
| Property | Metals | Non-Metals |
|---|---|---|
| Appearance | Lustrous (Shiny). | Dull (Except Iodine/Diamond). |
| Hardness | Hard (Except Sodium/Potassium). | Soft (Except Diamond). |
| Conductivity | Good (Best: Silver). | Poor (Except Graphite). |
| Malleable | Can be beaten into sheets. | Brittle (Bread-like). |
Phase 2: The Core Logic (Chemical Reactions)
1. The Reactivity Ladder
Think of elements as people in a playground. The "Strongest/Most Reactive" ones stay at the top.
- Top (Very Reactive): Potassium (K), Sodium (Na) -> Must be kept in Kerosene.
- Middle (Reactive): Iron (Fe), Zinc (Zn), Lead (Pb).
- Bottom (Least Reactive): Gold (Au), Platinum (Pt) -> The "Noble Metals".
2. Amphoteric Oxides
Some oxides act as both Acid and Base. Ex: Aluminium Oxide () and Zinc Oxide (ZnO).
Phase 3: The Exam Edge (Alloys & Uses)
1. Alloys: The Hybrid Metals
An alloy is a mixture of two or more metals (or a metal and a non-metal).
| Alloy | Composition | Common Use |
|---|---|---|
| Brass | Copper (Cu) + Zinc (Zn) | Utensils, Musical instruments. |
| Bronze | Copper (Cu) + Tin (Sn) | Medals, Statues. |
| Stainless Steel | Iron + Chromium + Nickel | Surgical tools, Kitchenware. |
| Solder | Lead (Pb) + Tin (Sn) | Joining electrical wires. |
[!TIP]
Amalgam: If one of the metals in an alloy is Mercury (Hg), it is called an Amalgam.
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