Metals look shiny as light that falls on metal surface collides with mobile electrons and make them _ These electrons give light when _
Correct answer: B. Excited De-excited
- A. Neutral Excited
- B. Excited De-excited
- C. De-excited Excited
- D. None of these
Explanation
Option B is correct since when a photon arrives at the metal's surface, they are absorbed because there is an energy gap between orbitals corresponding to the energy of the photon. This process promotes electrons up to a higher energy level(excited). As the electrons drop back down to a lower energy level(de-excited), the photons are re-emitted, resulting in the characteristic metallic luster.
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About Crystalline Solids
Crystalline solids contain particles arranged in a regular repeating lattice described by a unit cell. Their study includes coordination number, packing efficiency, density, anisotropy, cleavage, polymorphism and common crystal systems, along with ionic, molecular, covalent network and metallic crystals. Crystalline order differs from the random arrangement of amorphous solids.
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