Argon is a colorless, odorless and odorless inert gas, which is gaseous at normal temperature and pressure. Argon is a rare gas with low content in the earth's atmosphere, but it is one of the very important industrial gases.
2. Because the atomic weight of argon is the highest among all elements, it has strong electronegativity and nonmetal, which makes argon a very good ionized gas and can be used as a protective gas in electronics and industrial equipment.
3. There are two main methods to make argon: one is to use the evaporation of liquid argon to heat the liquid argon above the boiling point and evaporate it into gaseous argon; Another method is to prepare it by electrolyzing argon ions in an aqueous solution.
4. Argon gas is widely used in welding, cutting, heat treatment, semiconductor manufacturing, light bulb manufacturing, optical coating and other fields. In addition, argon can also be used in scientific research, medical treatment and national defense.
The concept of molecules and related knowledge
1. molecule is the most basic component of chemical substances. They are composed of atoms bound by valence bonds and can be split into atoms by physical or chemical methods.
2. Atom is the smallest unit of all matter. They are the material sources of elements and are inseparable. A single atom can't form any substance by itself. Only by combining valence bonds to form molecules can we form all kinds of substances we see in our daily life.
Molecules are formed by two or more atoms enjoying electrons through * * *. These * * * electrons form chemical bonds between atoms, making them form stable connections. Chemical bonds can be broken or formed, which determines the physical and chemical properties of substances, such as hardness, melting point, color and so on.
The connection between atoms in a molecule determines the shape and size of the molecule. Molecules can range in size from very small (such as hydrogen molecules) to very large (such as protein). The shape of molecules can affect the properties of substances in many ways, such as the physical state (solid, liquid and gas), optical properties (such as color), electrical properties (such as conductivity) and so on.
5. Molecules are the basis of chemical reactions. When chemical bonds between molecules are broken or formed, chemical reactions will occur. These reactions include decomposition, synthesis, oxidation, reduction and so on. Therefore, molecules and chemical reactions play a central role in chemical science, which is very important for understanding the working mode of the world around us.