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Lesson
Metals and Non-metals — Complete Lesson
?? Physical Properties of Metals vs Non-metals
| Property | Metals | Non-metals |
|---|---|---|
| Lustre | Shiny ? | Dull (except iodine, diamond) |
| Hardness | Hard (except Na, K) | Soft (except diamond) |
| Malleability | Can be beaten into sheets | Brittle |
| Conductivity | Good conductors | Poor (except graphite) |
| State | Solid (except mercury) | Solid/Liquid/Gas |
?? Bollywood Analogy: Metals are like Bollywood superstars — shiny, tough, conduct (energy to audiences), and can be shaped into any role. Non-metals are like indie artists — varied, unique, sometimes brittle but include diamonds (the most precious)!
? Reactivity Series
Metals arranged in decreasing order of reactivity:
K > Na > Ca > Mg > Al > Zn > Fe > Ni > Sn > Pb > [H] > Cu > Hg > Ag > Au > Pt
?? Extraction of Metals
- Low reactivity (Cu, Ag): Roasting/reduction with heat
- Medium reactivity (Fe, Zn): Reduction with carbon (coke)
- High reactivity (Na, K, Al): Electrolytic reduction
??? Corrosion and Prevention
Corrosion: Metals slowly get eaten away by air, moisture, and acids. Iron rusting (Fe2O3) is the most common example.
Prevention: Painting, oiling, galvanising (zinc coating), alloying, electroplating.
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MCQ Practice
Metals and Non-metals — MCQ Practice
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Memory Trick
Metals and Non-metals — Mnemonic
Mnemonic 1: For Properties of Metals ⚙️🔥
"Shiny MAMA Can Really Conduct Electricity"
- Shiny – Metals have a lustrous surface ✨
- M – Malleable (can be hammered into sheets) 🔨
- A – Ductile (can be drawn into wires) 🧵
- M – Metallic (good conductors of heat and electricity) ⚡
- A – Atomic (usually solid at room temperature except mercury) 🧪
- Can Really Conduct Electricity – Emphasizes conductivity ⚡
Mnemonic 2: Non-metals Properties 🌿💨
"Non-Metal's Soft, No Shine, Breaks Fine"
- Soft – Most non-metals are brittle and soft 🧸
- No Shine – Non-metals are dull, no lustre ✨❌
- Breaks Fine – Breaks easily, not malleable or ductile 🪨
Mnemonic 3: Remembering Common Metals in India 🇮🇳🔧
"Clever Boys Always Find Good Zinc"
- C – Copper (used in electrical wires, Indian homes) 🔌
- B – Brass (an alloy, used in utensils and musical instruments) 🥁
- A – Aluminium (lightweight, used in packaging and vehicles) 🚗
- F – Iron (used in construction, railways) 🚂
- G – Gold (precious metal, jewellery) 💍
- Zinc – Used for galvanization to prevent rusting 🛡️
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