chemical group的意思|示意

Chemical group is a basic unit of elements used to analyze the chemical characteristics of a variety of substances. It refers to a set of elements that have similar chemical properties. For example, the alkali metal group consists of six elements, including lithium, sodium, potassium, rubidium, cesium and francium. The elements in the same chemical group are likely to have almost the same physical and chemical properties.

In general, the properties of chemical groups can be described as three aspects:

1. Valency: The number of electrons in the outermost orbit of the atom of each element in the chemical group is the same. For example, the alkali metal group has a common valence of 1.

2. Chemical properties: The same chemical group elements tend to have similar chemical properties, such as reactivity, stability, hardness and reactivity with other elements of other elements.

3. Physical properties: The same chemical group elements tend to have similar physical properties, such as melting point, boiling point, and so on.

In short, the elements in the same chemical group have similar valence, chemical properties and physical properties, which can help us understand the chemical characteristics of substances and better use these substances.