Here's why:
* Luster: Nonmetals generally lack a shiny appearance, unlike metals. They tend to be dull or have a powdery appearance.
* Conductivity: Nonmetals are poor conductors of heat and electricity. This is because their electrons are tightly bound to their atoms, making it difficult for them to move freely and carry a charge.
Examples of nonmetals:
* Carbon
* Oxygen
* Sulfur
* Phosphorus
* Chlorine
* Bromine
* Iodine
Let me know if you have any other questions!