Question

The metallic lustre exhibited by sodium is explained by:

• A. Diffusion of sodium ions
• B. Oscillation of loose electrons
• C. Excitation of free protons
• D. Existence of body centered cubic lattice

Answer 1

The correct option is B Oscillation of loose electrons

The metallic lustre exhibited by sodium is explained by oscillation of loose electron.
When light falls on the surface of sodium, the free electron starts oscillating at its mean position and get excited to higher levels. On returning back to lower levels, it emits light in all directions. Due to this sodium has a characteristic metallic lustre.
Hence, correct answer is option (b).