PB is a symbol in the periodic table that represents lead. Lead is a chemical element that belongs to group 14 (IVB) of the periodic table. It has an atomic number of 82 and has 82 protons and 82 electrons.
Lead is a heavy metal that occurs in many forms in nature. The most common lead isotopes are lead-208, lead-206, lead-207. The amount of lead in the earth's crust is about 00013%, which is mainly found in nature in the form of lead ore, such as lead ore (lead sulfide).
Lead is a silvery-white metal with a high density (11.).34 g cm), lower melting point (3275 °C) and boiling point (1749 °C). It has good ductility and malleability, and has some corrosion resistance to most acids and bases. In addition, lead is a good shielding material and has a good effect on blocking rays.
In industry, lead is widely used in automotive batteries, building materials, electronic products, lead-acid batteries, anti-radiation materials, warheads, welding materials, etc. Due to its good ductility and high density, lead is also used in the manufacture of pipes, roof coverings, safety glass, etc. In addition, lead is also used in the production of chemicals such as pigments, ceramic glazes, plastic additives, etc.
However, lead is also a toxic element, and long-term or excessive exposure to lead can cause serious health effects on humans. Lead poisoning can cause neurological and kidney damage, especially in infants, young children and pregnant women. Therefore, when using lead and handling lead products, appropriate precautions need to be taken to reduce health hazards.
The chemical element represented by PB is lead, which is a heavy metal with good ductility and malleability, and is widely used in industry and other fields. However, it is important to be aware of the health effects when using lead and handling lead products, and to take appropriate precautions. Chemical elements