Which of the following is incorrect information?
Correct answer: B. The electrical conductivity of metals increases with the increase in temperature
- A. Metals have free electrons in the valence shell
- B. The electrical conductivity of metals increases with the increase in temperature
- C. Metalloids are poor conductors of electricity
- D. Non-metals have atomic conductance usually less than 10-10 ohm-1
Explanation
Statement B is incorrect because the electrical conductivity of metals decreases with an increase in temperature, not increases. This phenomenon is known as thermal resistivity or positive temperature coefficient of resistance. As the temperature of a metal increases, the vibrations of atoms and lattice defects increase, leading to more collisions with the free electrons responsible for electrical conduction. These collisions impede the flow of electrons, resulting in higher resistance and decreased electrical conductivity.
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About Transition Elements
Transition elements are identified by their partially filled d subshells in atoms or common ions. The topic covers the electronic structure of d-block elements, including the filling order of 4s and 3d orbitals, variable oxidation states and the distinction between transition elements and elements with completely filled d subshells.
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