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Electrical conductance through metals is called metallic or electronic conductance and is due to the movement of electrons. The electronic conductance depends on:
  • a)
    The nature and structure of the metal
  • b)
    The number of valence electrons per atom
  • c)
    Change in temperature
  • d)
    All of these
Correct answer is option 'D'. Can you explain this answer?
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Electrical conductance through metals is called metallic or electronic...
Electricity is conducted through an electrolytic solution due to the movement of ions called electrolytic conduction.
Electrical conductance depends upon-
  • Nature of electrolyte: The conductance of an electrolyte depends upon the number of ions present in the solution. Therefore, the greater the number of ions in the solution, the greater is the conductance.
  • Concentration of the solution: The molar conductance of electrolytic solution varies with the concentration of the electrolyte. In general, the molar conductance of an electrolyte increases with decrease in concentration or increase in dilution.
  • Temperature: The conductivity of an electrolyte depends upon the temperature. With increase in temperature, the conductivity of an electrolyte increases.
  • Valence electrons per atom present in metals describes the electric conductance of it.
  • Nature and structure is also a significant factors which influences electrical conductance.
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Electrical conductance through metals is called metallic or electronic...
Nature and Structure of the Metal
The electronic conductance of metals is highly dependent on their nature and structure. Different metals have different arrangements of atoms in their crystalline structures, which can affect the movement of electrons. For example, metals with a more closely packed arrangement of atoms tend to have higher electronic conductance because the electrons can move more freely between the atoms.

Number of Valence Electrons per Atom
The number of valence electrons per atom in a metal also plays a significant role in electronic conductance. Valence electrons are the outermost electrons of an atom and are responsible for the bonding and conductivity of metals. Metals with a higher number of valence electrons have a greater capacity for electronic conductance because there are more electrons available to move and carry electric current.

Change in Temperature
The electronic conductance of metals can also be influenced by changes in temperature. Generally, as the temperature of a metal increases, its electronic conductance also increases. This is because the increase in temperature provides more energy to the electrons, allowing them to move more freely within the metal lattice. However, at extremely high temperatures, the lattice structure of the metal may become disrupted, leading to a decrease in electronic conductance.

All of These
All of the factors mentioned above – the nature and structure of the metal, the number of valence electrons per atom, and changes in temperature – collectively determine the electronic conductance of metals. Each factor contributes to the overall ability of electrons to move through the metal lattice and carry electric current. Therefore, the correct answer is option 'D' – all of these factors affect electronic conductance.
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A dense collection of equal number of electrons and positive ions is called neutral plasma. Certain solids containing fixed positive ions surrounded by free electrons can be treated as neutral plasma. Let ‘N’ be the number density of free electrons, each of mass ‘m’. When the electrons are subjected to an electric field, they are displaced relatively away from the heavy positive ions. If the electric field becomes zero, the electrons begin to oscillate about the positive ions with a natural angular frequency ‘ωp’ which is called the plasma frequency. To sustain the oscillations, a time varying electric field needs to be applied that has an angular frequency ω, where a part of the energy is absorbed and a part of it is reflected. As ω approaches ωp all the free electrons are set to resonance together and all the energy is reflected. This is the explanation of high reflectivity of metals. Q.Taking the electronic charge as ‘e’ and the permittivity as ‘ε0’. Use dimensional analysis to determine the correct expression for ωp.

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Electrical conductance through metals is called metallic or electronic conductance and is due to the movement of electrons. The electronic conductance depends on:a)The nature and structure of the metalb)The number of valence electrons per atomc)Change in temperatured)All of theseCorrect answer is option 'D'. Can you explain this answer?
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