Class 7 Exam > Class 7 Notes > Science (Curiosity) Class 7 - New NCERT > Infographics: Properties of Metals and non-metals
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FAQs on Infographics: Properties of Metals and non-metals - Science (Curiosity) Class 7 - New NCERT
| 1. What are the main properties of metals? |  |
Ans.Metals are generally characterized by their conductivity, malleability, ductility, and luster. They are good conductors of heat and electricity, which makes them useful in electrical wiring and heating applications. Metals are malleable, meaning they can be hammered or rolled into thin sheets, and ductile, which allows them to be drawn into wires. Additionally, metals have a shiny appearance or luster, which is why they are often used in jewelry and decorative items.
| 2. What are the main properties of non-metals? | |
Ans.Non-metals exhibit different properties compared to metals. They are usually poor conductors of heat and electricity, which makes them insulators. Non-metals are not malleable or ductile; instead, they are brittle in solid form and break easily. They generally have a dull appearance and can exist in various states at room temperature, including gases (like oxygen), liquids (like bromine), and solids (like sulfur).
| 3. How do metals and non-metals differ in terms of reactivity? | |
Ans.Metals tend to lose electrons during chemical reactions, making them more reactive, especially with non-metals. For instance, alkali metals (like sodium) react vigorously with water. Non-metals, on the other hand, typically gain or share electrons during reactions, which can make them reactive as well, but their reactivity varies widely. For example, halogens (like chlorine) are very reactive non-metals, while noble gases (like neon) are largely inert.
| 4. Can you provide examples of common metals and non-metals? | |
Ans.Common examples of metals include iron (Fe), copper (Cu), aluminum (Al), and gold (Au). These metals are widely used in construction, electrical applications, and manufacturing. On the non-metal side, examples include carbon (C), nitrogen (N), oxygen (O), and sulfur (S). Non-metals play crucial roles in biological processes and are essential for life, such as oxygen for respiration.
| 5. Why are metals considered good conductors of electricity? | |
Ans.Metals are considered good conductors of electricity due to the presence of free-moving electrons within their structure. In metallic bonds, atoms release some of their electrons, allowing these delocalized electrons to move freely throughout the metal lattice. This movement of electrons is what facilitates the conduction of electrical current, making metals ideal for electrical wiring and components.
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