Question

Metallic Lustre Is Explained By:

• A. Diffusion Of Metal Ions
• B. Existence Of Bcc Lattice
• C. Excitation Of Free Protons
• D. Oscillation Of Loose Electrons

Answer 1

The correct option is D

Oscillation Of Loose Electrons

Explanation for Correct option:

Option (D) Oscillation of loose electrons

• The Luster can be referred to as the way the light is reflected from the surface of the material, it relates to the gloss or shine of the material.
• The metals are lustrous because of the presence of free electrons in their structure.
• In the periodic table, the metals are placed in either s-block or in d-block, so their valence electrons are either in s-orbital or in d-orbital.
• The incident light imparts on the metal surface, these electrons can absorb the energy of photons and get excited and will start oscillating due to the energy of the photons.
• Thus they lose energy and come back to the ground state during this process, they can emit a certain wavelength and thus the light is emitted in all directions.
• Therefore, metallic luster can be explained by the oscillation of loose electrons
• Hence option (D) Excitation of free protons is correct.

Explanation for incorrect options:

Option (A) Diffusion of metal ions

• Diffusion is the rearrangement of the atoms inside the crystal lattice structure of the metal.
• The random motion of molecules by which there is a net flow of matter from a region of high concentration to a region of low concentration.
• Diffusion can't explain metallic luster.
• Hence option (B) Diffusion Of Metal Ions is incorrect.

Option (B) Existence of BCC lattice

• The BCC lattice is considered as a unit cubic cell with two lattice points per cell.
• The number of nearest neighbors of each lattice point is eight.
• The existence Of BCC Lattice can't explain metallic luster.
• Hence option (B) Existence Of BCC Lattice is incorrect.

Option (C) Excitation of free protons

• Proton emission is also known as proton radioactivity and it is a rare type of radioactive decay in which protons are ejected from a nucleus.
• The existence of free protons can't explain metallic luster.
• Hence option (C) Existence of free protons is incorrect.