Question

Metallic lustre exhibited by sodium is due to:

• A. diffusion of sodium ion
• B. oscillation of loose electron
• C. oscillalation of free protons
• D. existence of lattice structure

Answer 1

The correct option is B oscillation of loose electron

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 , option B is correct .