6. List some physical properties of the metals.

Here are some common physical properties of metals:

1. Luster: Metals often have a shiny appearance when polished or freshly cut. This property is known as metallic luster and is due to the reflection of light by the metal's surface.

2. Malleability: Metals can be hammered or rolled into thin sheets without breaking. This property allows metals to be shaped into various forms, such as sheets or foils.

3. Ductility: Metals can be drawn into thin wires without breaking. This property is known as ductility and is essential for applications such as wiring and cables.

4. Conductivity: Metals are generally good conductors of heat and electricity due to the presence of free electrons in their atomic structure. These free electrons can move freely throughout the metal, allowing for the transfer of heat and electricity.

5. High Density: Metals typically have high densities, meaning they have a high mass per unit volume. This property makes metals feel heavy and solid compared to non-metals.

6. High Melting and Boiling Points: Metals generally have high melting and boiling points compared to non-metals. This property is due to the strong metallic bonds between atoms in the metal's crystal lattice.

7. Magnetic Properties: Some metals, such as iron, nickel, and cobalt, exhibit magnetic properties. These metals can be attracted to magnets and can be magnetized themselves.

8. Opacity: Many metals are opaque to visible light, meaning they do not allow light to pass through them. This property is why metals are used in the construction of opaque objects such as containers and machinery.

9. Sonorousness: Metals produce a characteristic ringing sound when struck. This property is known as sonorousness and is due to the metal's ability to vibrate at a particular frequency.

These are just some of the physical properties commonly associated with metals. It's worth noting that not all metals exhibit every property listed above, and the specific properties of a metal can vary depending on factors such as its composition, structure, and treatment.