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Element Essential Knowledge

Material Essential Knowledge

Elements

Chemical element is the general name for a type of atoms with the same nuclear charge which has number of protons in the nucleus. From a philosophical perspective, elements are the result of qualitative changes caused by quantitative changes in the number of protons in atoms.

Periodic Table of Elements

The periodic table of chemical elements is a list of chemical elements ordered from smallest to largest atomic weight. The list is generally rectangular, with spaces left in the periods of some elements so that elements with similar properties can be grouped into the same group, such as alkali metal elements, alkaline earth metals, halogen elements, rare gases, nonmetals, transition elements, etc. This makes the elements in the periodic table divided into seven main groups, seven sub-groups, Group VIII and Group 0. Because the periodic table accurately predicts the properties of various elements and their relationships, it is widely used in chemistry and other sciences as a useful framework for analyzing chemical behavior.

Periodic Law of Elements

The periodic law of elements refers to the law that the properties of elements change periodically as the atomic number of the element increases (i.e., the number of electrons outside the nucleus or the number of nuclear charges). The discovery of periodic laws is an important milestone in the process of chemical systematization.

Elemental Powder

Powder particles composed of a single elemental component.

Rare Earth Elements

Rare earth is not the rarest element, it is a name left over from history. Rare earths have been discovered since the end of the 18th century. At that time, people often referred to solid oxides that were insoluble in water as earth. For example, aluminum oxide was called "ceramic clay", calcium oxide was called "alkaline earth", etc. Rare earths are generally separated in the oxide state and were relatively rare at the time, hence the name Rare Earth (RE or R for short).

Gas Element

Oxygen (O), nitrogen (N), hydrogen (H), argon (Ar)

Atomic ratio

Atomic ratio

mass ratio

mass ratio

Elemental Composition

A pure substance composed of elements is called a simple substance. As opposed to simple substances, pure substances composed of multiple elements are called compounds. Most substances are compounds in nature.

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