Give 25 examples of appearance and hardness of materials
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Iron rod/nail, Sulphur, Coal piece, Copper wire. Observe and group these materials into good conductors and poor conductors.iron, copper, aluminium, calcium, magnesium, etc. In contrast, materials like coal and sulphur are soft and dull in appearance.
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Iron rod /nail , Sulphur, Coal pieces, Copper wire.
In constract materials like coal and sulphur are soft and dull in appearance
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