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Questions and Answers
What term is used to describe elements that exhibit properties of both metals and non-metals?
What term is used to describe elements that exhibit properties of both metals and non-metals?
- Halogens
- Metalloids (correct)
- Noble gases
- Metals
Which of these metals is considered the most ductile?
Which of these metals is considered the most ductile?
- Copper
- Aluminium
- Silver
- Gold (correct)
Which property allows metals like gold and silver to be beaten into thin sheets?
Which property allows metals like gold and silver to be beaten into thin sheets?
- Ductility
- Malleability (correct)
- Luster
- Hardness
What is a notable exception among metals regarding thermal conductivity?
What is a notable exception among metals regarding thermal conductivity?
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What characteristic is primarily responsible for a metal's ability to conduct electricity?
What characteristic is primarily responsible for a metal's ability to conduct electricity?
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Study Notes
Metals and Non-metals
- There are about 118 elements known
- Elements are categorized into metals, non-metals, and metalloids
- Metals form positive ions by losing electrons
- Examples of metals include copper, iron, aluminium, sodium
Physical Properties of Metals
- Metals have a shiny surface called metallic luster, for example, gold, silver, and platinum
- Most metals are hard, but some alkali metals like lithium, sodium, and potassium are soft and can be cut with a knife
- Metals are ductile, meaning they can be drawn into thin wires, with gold being the most ductile
- Metals are malleable, meaning they can be beaten into thin sheets, with gold and silver being the most malleable
- Most metals conduct electricity, with the flow of free electrons allowing for electrical conductivity
- Metals are good conductors of heat, with copper and silver being the best conductors, while lead and mercury are poor conductors
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