Which of these is a non-metal?

To identify which element is a non-metal, we examine the properties and positions of each option on the periodic table: 1. **Iron ($Fe$):** Iron is a transition metal. It is shiny, malleable, and a good conductor of heat and electricity. 2. **Carbon ($C$):** Carbon is located in Group 14. It lacks the typical metallic properties of high ductility and conductivity (though graphite is a partial exception). It is chemically classified as a **non-metal**. 3. **Copper ($Cu$):** Copper is a transition metal known for its excellent electrical conductivity. 4. **Gold ($Au$):** Gold is a highly unreactive transition metal. Therefore, Carbon is the only non-metal in the list.