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Which of the following physical properties is true for metals?
Metals are lustrous and good conductors of electricity
Metals are solid at room temperature
Metals are brittle and break easily
Metals are poor conductors of heat Question ID : 4410091450010 Option 1 ID : 4410095728543 Option 2 ID : 4410095728542 Option 3 ID : 4410095728541 Option 4 ID : 4410095728540 Status : Answered Chosen Option : A
Metals are lustrous and good conductors of electricity
Metals are elements characterized by their ability to lose electrons to form positive ions. Physically, they exhibit metallic luster due to the reflection of light by free electrons and possess high thermal and electrical conductivity because these delocalized electrons move freely through the metallic lattice.
Metals are elements characterized by their ability to lose electrons to form positive ions. Physically, they exhibit metallic luster due to the reflection of light by free electrons and possess high thermal and electrical conductivity because these delocalized electrons move freely through the metallic lattice.
Think of the free electrons in a metal like a busy crowd in a subway station; they move quickly and easily, allowing information (electricity) and energy (heat) to pass through the station much faster than through an empty room.
L-E-M: Lustrous, Electricity, Malleable (or Ductile).
J=╧ГE тАФ Ohm's Law in microscopic form where J is current density, ╧Г is conductivity, and E is electric field
The electrical and thermal conductivity of metals is governed by the 'Electron Sea Model'. In this model, metal atoms release their valence electrons into a shared pool (a sea of delocalized electrons). These mobile electrons act as charge carriers in an electric field and as kinetic energy transfer agents during heat conduction.
Metals are typically malleable (can be beaten into sheets) and ductile (can be drawn into wires).
Most metals are solids at room temperature, with Mercury (Hg) being a notable exception.
Metallic bonding is responsible for their high melting and boiling points.
High electrical conductivity makes them ideal for wiring.
High thermal conductivity is useful for cookware and heat sinks.
Susceptibility to corrosion or oxidation when exposed to air and moisture.
Copper wiring for power distribution
Aluminum for heat exchangers and cookware
Option B is incorrect because Mercury (Hg) is a liquid at room temperature.
Option C is incorrect because metals are malleable and ductile, whereas brittleness is a property of non-metals.
Option D is incorrect because metals are among the best thermal conductors.
A is correct тАФ Metals possess delocalized electrons that provide both metallic luster and the ability to conduct electricity efficiently.
Remember exceptions for exams: Mercury is a liquid metal, and Graphite (a non-metal) conducts electricity, while Lead is a poor conductor of heat compared to other metals.
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