Non-metals are elements that generally lack the properties of metals. They are poor conductors of heat and electricity, have low densities, and are often brittle. Non-metals are essential for life and play a vital role in many biological processes. Some examples of non-metals include:

- Hydrogen (H)

- Helium (He)

- Carbon (C)

- Nitrogen (N)

- Oxygen (O)

- Fluorine (F)

- Chlorine (Cl)

- Bromine (Br)

- Iodine (I)

Many non-metals exist as gases at room temperature, while others are liquids or solids. They can form a wide variety of compounds with metals and other non-metals. Non-metals are also found in many natural materials, such as water, air, and rocks.