Metal has good electrical conductivity due to the tendency of electrons to break away, and metal elements usually have positive valence charges in compounds. However, when the temperature is higher, due to the thermal shock of the nucleus, the resistance will become larger. The bonds between metal molecules are metal, so they can be replaced at will, which is why metals are so stretchy.

In nature, most metals exist in a combined state, while a few metals, such as gold, silver, platinum and bismuth, exist in a free state. Metallic minerals are mostly oxides and sulfides, other forms of chloride, sulfate, carbonate and silicate.

Substances belonging to metals include gold, silver, copper, iron, manganese, zinc and so on. All metals except mercury (liquid) are solid at room temperature of 25 degrees Celsius at one atmosphere pressure. Most pure metals are silver-white (grey), but a few are not, such as gold, which is yellowish, and copper, which is purplish. Metals mostly belt next to "anium".

Substances with positive temperature resistivity are usually defined as metals. The metallic element is located at the lower left side of the "boron-astatine boundary", and there are metallic elements in the s, P, D, and F zones, and the transition elements are all metallic elements.

In a solid metal conductor, there are many movable free electrons. Although these electrons are not bound to any particular atom, they are bound to the lattice of the metal; And even in the absence of an external electric field, because of heat, these electrons will still move around randomly. However, in the conductor, the average net current is zero. You pick any cross section inside the wire, and at any time interval, the number of electrons that move from one side of the cross section to the other is equal to the number of electrons that move in the opposite direction across the cross section.