What is a chemical halogen, what does halogen mean

Flip to the periodic table at the end of the textbook and count the second column from right to left, the Roman numeral group 7a, this column of elements (including CFO) and iodine is collectively referred to as halogens.

Halogens, that is, salts, halogens are natural salt-forming elements, because we first extracted them from salty seawater, so they are called halogens.

The elements of the seventh main group are also called halogen elements, referred to as halogens!

Halogen elements refer to periodic group A elements. Including fluorine (F), chlorine (Cl), bromine (br), iodine (I), astatine (AT), referred to as halogen. They are all found in nature as typical salts.

It is a salt-forming element. With the increase of molecular weight, the dispersion force between halogen molecules gradually increases, the color becomes darker, and their melting point, boiling point, density, and atomic volume also increase in turn. Halogens are oxidizing, and fluorine elements are the most oxidizing.

Halogens and metals constitute a large number of inorganic salts, and they also play an important role in organic synthesis and other fields.

The chemical properties of halogens are very similar, they have 7 electrons on the outermost electron shell, and there is a tendency to obtain an electron to form a stable octapographic structure of halide ions, so halogens have oxidation, the smaller the atomic radius, the stronger the oxidation, so fluorine is the strongest oxidation in the element. With the exception of f, halogens have oxidation states of +1, +3, +5, +7 and form ionic compounds with typical metals, while other halides are covalent compounds. Halogens are combined with hydrogen to form hydrogen halide, which is dissolved in water to form hydrogen halide acid.

The compounds formed between halogens are called polyhalides, such as ClF3, ICL. Halogens can also form oxygenated acids in a variety of valence states, such as HClO, HCO2, HCO3, and HCO4. Halogen elements are very stable, and with the exception of I2, halogen molecules are difficult to decompose at high temperatures.

Halogens and their compounds are very versatile. For example, the table salt we consume every day is mainly chloride, which is composed of chlorine and sodium.

The toxicity of halogen elements decreases sequentially from f.

From F to AT, the acidity of the hydride increases sequentially, but the stability of the hydride decreases.

Oxidation: F2>

cl2>

br2>

i2 > at2, but the opposite is reductive.

In addition, halogens are chemically reactive, so halogens only exist in nature in a chemical state.

Periodic table.

F (fluorine), Cl (chlorine), BR (bromine), I (iodine), AT (astatine) elements.

However, AT is a radioactive element that rarely exists in nature, so the halogens generally refer to the first four items.

Explanation of halogens.

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Homohalogen 1 Detailed explanation The chemical properties of the five elements of fluorine, chlorine, bromine, iodine, and astatine are very similar, and they form a family called halogens. It can be directly and metallized to synthesize salts, which is one of the strongest oxidants and an important chemical raw material, which can be used to make drugs, dyes, plastics, synthetic rubber, etc. It is also called halogen or halogen.

Word decomposition Explanation of halogen halogen (halogen) The black juice left over from the preparation of salt, bitter and poisonous in taste. It is also known as "salt brine" and "bitter juice". Thick auspicious juice:

Marinade. Lo mein. Make food with thick sauces such as spiced salty water or soy sauce:

Braised shrimp. Braised tofu. Gu Tong "Lu", reckless.

Ancient with "lurd", big shield. Ancient Tong "captivity", plundering Explanation of Vegetarian Vegetarian ù True Color, White: Plain Clothing.

Plain silk. The color is simple, not showy: plain.

Plain. Plain makeup. Simple but elegant.

Sketch. White Jinhong Spike Silk: Ruler (Letter written with silk biko).

Original, rustic, unadorned: quality. Attainment.

Primality. Suyou (sincere and simple friend). The basic ingredients of the substance.

The meaning of halogen is as follows:

Halogen is a group 7a non-metallic element, including fluorine, chlorine, bromine, iodine and astatine, collectively known as halogen;

Among them, astatine is a radioactive element, and the halogenated paratravelin that people usually refer to is fluorine, chlorine, bromine, and iodine;

Chlorine has the widest range of existence, decreasing in the order of fluorine, bromine and iodine, and astatine is an artificially synthesized yuanqixiaoxin;

Halogen elements are all bi-primordial stool molecules, both of which are highly volatile, and the melting and boiling points increase with the increase of atomic number.

At room temperature, fluorine and chlorine are gases, bromine is liquids, and iodine is solids.