Electron gas theory was proposed to explain the bonding in solids:
Correct answer: D. Metallic
- A. Molecular
- B. Ionic
- C. Covalent
- D. Metallic
Explanation
Explanation:Electron gas theory was proposed by Drude and Loren. It helps explain the bonding in metals. According to this theory, each atom in a metal crystal loses all of its valence electrons. These electrons form a pool or a gas. The positively charged metal ion are held together by electron gas.This option is not correct because molecular solids are held together by covalent bonds between molecules. This option is also incorrect because ionic solids are held together by electrostatic attractions between positively and negatively charged ions. This option is also incorrect because covalent solids are held together by covalent bonds between atoms, and they often have high melting points and are very hard.
This question appeared on the UHS MDCAT 2009 paper, which you can sit online with every answer explained.
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About Electronic Structure of d-Block Elements
The electronic structure of d-block elements covers the filling of the (n-1)d and ns orbitals, general electronic configurations, and the exceptions shown by chromium and copper. It explains how partially filled d orbitals produce variable oxidation states, coloured ions, magnetic behaviour and complex formation, while distinguishing transition elements from elements with completely filled d subshells.
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