Explanation of ap element nouns

The AP element is an HTML page element, also known as a "layer".

There are 1 and 16 groups in the periodic table of elements, which are 7 main groups, 7 sub-groups, 1 0 group and 1 8 group respectively.

2. The periodic table of chemical elements is a list of chemical elements sorted from small to large according to the number of nuclear charges. The list is generally rectangular, and some elements have spaces in the period, so that elements with similar characteristics belong to the same group, such as alkali metal elements, alkaline earth metals, halogen elements, rare gases and so on.

This makes the periodic table of elements divided into 7 main groups, 7 sub-groups, 8 groups and 0 groups. Because the periodic table of elements can accurately predict the characteristics of various elements and their relationships, it is widely used in chemistry and other scientific fields as a very useful framework for analyzing chemical behavior.

3. Main group elements are the chemical classification of elements, which refers to the elements in S and P regions of the periodic table. Another definition of main group elements is that the number of electrons in the electron shell except the outermost electron shell is a fully electronic chemical element. All elements in the periodic table except transition metals, lanthanides, actinides and inert gases are main group elements.

4. The number of atoms of the same main group element increases gradually from top to bottom, the number of electron layers increases gradually, the atomic radius increases gradually, the ability to gain electrons decreases gradually, the ability to lose electrons increases gradually, the metallic nature of elements increases gradually, the nonmetallic nature decreases gradually, and the stability of gaseous hydrides decreases gradually. The ions of main group elements (including oxyacid radicals) in aqueous solution are colorless.