Substances made up of different kinds of atoms may be

Elemental] Substances that are made up of different kinds of atoms may be elemental. (e.g. HD, DT, HT, etc.).

An elemental substance is a substance with only one element, but it should be noted that a substance composed of the same element is not necessarily elemental, but may be a mixture, such as diamond.

and graphite, O2 and O3....

Metals] Substances made up of different kinds of atoms can be metals.

Different kinds of atoms may be isotopes.

Metals also have isotopes, and several atoms of the isotope can still make up pure metals.

Non-metals] Substances made up of different kinds of atoms may be non-metals.

Nonmetals also have isotopes, and several atoms of the isotope can still form pure nonmetals.

For example: h, deuterium, tritium).

Elemental --- must be a pure substance composed of atoms of the same kind. Different classes of atoms cannot form elemental substances.

Metals--- metal elementals are made up of the same kind of atoms. Metals made up of different types of atoms are mixtures, such as alloys.

Non-metals--- different atoms can form compounds, such as H2O; Different atoms can also form mixtures, such as hydrochloric acid.

Substances made up of different kinds of atoms must not be elemental because they are made up of different substances.

But different kinds of atoms may be isotopes, i.e., the same number of protons but different numbers of neutrons. This belongs to the same element. Therefore, both metallic and non-metallic are possible.

Except for acid-base salts, which are composed of ions, everything else is acceptable.

Pure: such as pure methane.

Mixture: A mixture of noble gases.

Elemental: A monoatomic molecule composed of different nuclides.

Compounds: Nonionic compounds made up of two or more atoms.

Metals: Various alloys.

Non-metallic: such as silica.

Oxides: sulfur dioxide, silicon dioxide, etc.

1. Elemental metal (all metallic substances). Noble gasesElemental(i.e. monoatomic molecules: helium, neon, argon, krypton, xenon, radon, where radon is radioactive.)

3. Atomic crystals(Atoms are covalently bonded to each other.)

That is, substances connected by common electron pairs, such as graphite, diamond, crystalline silicon, and silicon dioxide.

Aluminium chloride, for example, does not have the smallest particles that retain their chemical properties.

That is, there is no real molecular formula, there is only the simplest integer ratio between different atoms, except for elemental matter, of course, that is, for this kind of substance, you can understand it as a single molecule whose size can change arbitrarily, and their atomic number can change arbitrarily, but the proportion remains the same).

Determine whether matter is made of atoms:Among the chemical symbols, there is an element symbol.

And matter without numbers is directly composed of atoms. In addition to the above, other substances are composed of molecules such as: KMno4, KCl, H2O, H2O2, CO2, N2, O2, SO2, Fe3O4, MNO2, KCLO3, K2MNO4, H2, NO2, O3.

There are three types of substances directly composed of atoms: metals, non-metallic solids, and rare gases. Metals such as gold, silver, copper, iron, magnesium, mercury, etc.

Non-metallic solids, such as carbon, silicon, etc., rare gases: such as helium, neon, argon, krypton, xenon, etc. Atomic crystals directly composed of atoms through covalent bonds, such as silicon dioxide, silicon, diamond, silicon carbide, etc.

Characteristics of atomic composition

atoms, the smallest particles in chemical change. An atom is also a type of particle that makes up matter. For example, a small number of non-metallic elements, diamond, graphite, etc., metal elements, such as iron, mercury, etc., rare gases, etc.

The distribution of the electron shell outside the nucleus of the atom, and the hierarchical arrangement of electrons outside the nucleus: no more than 2 in the first shell and no more than 8 in the second shell. The outermost layer does not exceed 8.

The maximum number of electrons that can be accommodated in each layer is 2n2, and n represents the number of electron layers, that is, the first layer does not exceed 2, the second layer does not exceed 8, and the third layer does not exceed 18. The number of electrons in the outermost shell does not exceed 8, and when there is only 1 electron layer, a maximum of 2 electrons can be accommodated.

The atoms are also constantly moving, and although the atoms are small, they have a certain mass. The idea of the atom was introduced as far back as the 5th century BC. But there was no scientific experiment to support it, until the beginning of the 19th century, when the chemist Dalton proposed a scientific atomic theory in 1803, based on experimental facts and strict logical deductions.

Substances that are directly constituted by atoms are mainly of the following categories:

1) Metals. Such as gold, silver, copper, iron, magnesium, etc.

2) Non-metallic solids. Such as sulfur, carbon, silicon, phosphorus, etc.

3) Noble gases. Such as helium, neon, argon, krypton, xenon, etc.

Metals, noble gases, and solid non-metallic substances (such as phosphorus, sulfur, carbon, etc.).

Most of the metals and noble gases.