Identify the non-metal which is lustrous.

Most non-metals are dull (non-lustrous). However, iodine is a well-known exception because it has a shiny, lustrous appearance despite being a non-metal.

Among the given options:

Potassium → Metal ❌
Fluorine → Non-metal but non-lustrous ❌
Phosphorus → Non-metal, not typically cited for lustre ❌
Iodine → Non-metal and lustrous ✔️

Correct Answer: D) Iodine