The nature of the chemical element W! Use!

The chemical element symbol of tungsten is W, the atomic number is 74, the relative atomic mass is, the atomic radius is 137 picometers, and the density is grams per cubic centimeter, which belongs to the VIB group of the sixth (second longest) period in the periodic table. Tungsten is mainly a hexavalent cation in nature, and its ionic radius is. Due to the small radius of W6+ ions, high electricity price, strong polarization ability, and easy to form complex anions, tungsten is mainly in the form of complex anions [WO4]2-, which combines with cations such as Fe2+, Mn2+, and Ca2+ in solution to form wolframite or scheelite precipitation.

After smelting, tungsten is a silvery-white lustrous metal with an extremely high melting point, great hardness, very low vapor pressure, small evaporation rate, and relatively stable chemical properties. This is the basis for our understanding of what tungsten is. Basic Uses:

About 50% of the tungsten ore mined in the world is used for the smelting of high-quality steel, about 35% for the production of hard steel, about 10% for the production of tungsten wire, and about 5% for other purposes. Tungsten can be used to manufacture firearms, nozzles, metal cutting blades, drill bits, wire drawing dies, etc., tungsten is widely used, involving mining, machinery, construction, transportation, electronics, chemical industry, light industry, textile, military industry, science and technology, various industrial fields.

Is there such a substance? You flipped out of the **.

Tungsten carbide WC: molecular weight ; Tungsten Carbide Properties: Chemical formula WC.

Black hexagonal crystals. Density. Melting point (2870 50).

Boiling point 6000. The Mohs scale hardness is about 9. Insoluble in water, soluble in a mixture of nitric acid and hydrofluoric acid and aqua regia.

High acid resistance. High hardness. The modulus of elasticity is large.

The electrical conductivity is 40% that of metal. Chemically stable. Below 400, it does not interact with chlorine.

It is prepared by heating carbon black and tungsten powder to 1400 1500. It is widely used as high-speed cutting turning tools, kiln structural materials, jet engine parts, cermet materials, resistance heating elements, etc.

Tungsten. Chemical element.

The symbol is w, atomic number.

is 74, relative to atomic mass.

for, atomic radius.

for 137 picometers.

The density is grams each.

Cubic centimetre. Clear oak belongs.

Periodic table.

In the sixth cycle (second.

Long cycles. of the VIB family. Tungsten is mainly a hexavalent cation in nature.

Ionic radius. For. Due to W6+ ions.

The radius is small, the electricity price is high, the polarization ability is strong, and it is easy to form complex anions, so tungsten is mainly in the form of complex anions [wo4]2-, which is similar to that in solution.

Fe2, Mn2+, Ca2+ and other cations are combined to form. Black. Tungsten ore.

Or. Scheelite.

Precipitation. After smelting, tungsten is a silvery-white shiny metal with an extremely high melting point, great hardness, and vapor pressure.

It is very low, the evaporation rate is also small, and the chemical properties are relatively stable. This is the basis for our understanding of what tungsten is. Basic uses: About 50% of the tungsten ore mined in the world is used.

High-quality steel. About 35% of the smelting is used for the production of hard steel, and about 10% is used for the production.

Tungsten. About 5% of the rest is used for other purposes. Tungsten can be used to make firearms, nozzles, metal cutting blades, drills, etc

Drawing dies. Tungsten has a wide range of uses, including mining, machinery, construction, transportation, electronics, chemical industry, light industry, textile, military industry, science and technology, and various industrial fields.

Rhodium is resistant to acid and aqua regia, but reacts with hot concentrated sulphuric acid and hydrobromic acid at 200 600. The oxidation states of rhodium are 1, +1, +2, +3, +4. Stable with +3 and +4 valent compounds.

Rhodium readily forms coordination compounds such as CS[Rh(SO4)2].

Aqua regia is used to dissolve the treated platinum concentrate or the anode mud produced when electrolyzing non-ferrous metals, after a series of chemical treatments, ammonium rhodium hexachlorohydrate () can be obtained, which is heated to 1000 in the hydrogen gas stream after burning, and then reduced to spongy metal rhodium. Pure rhodium is used to make electrical contacts, electrical contactors with low contact resistance, high-strength springs, high-temperature heating wires, crucibles, electrodes, etc. Platinum rhodium alloys are used as heating wires, high-temperature heating materials, thermocouples, and catalysts in the synthesis of ammonia oxidation to nitric acid and hydrocyanic acid.

Rhodium-iridium alloys are used in the manufacture of high-grade mirrors and mirrors.

Rhodium is a transition metal found in platinum ore and used as a catalyst in some platinum alloys.

Episode 6: What are the chemical properties of a substance: This lesson introduces the definition of the chemical properties of a substance through three experiments: "iron rusting", "candle burning", and "copper sulfate reacts with sodium hydroxide". The properties of matter that manifest themselves in chemical changes are called chemical properties.

w Element name: tungsten.

It is a metal, the filament in an incandescent lamp, which is made of metal tungsten.

A chemical element is a general term for a class of atoms that have the same number of nuclear charges (i.e., the number of protons in the nucleus). From a philosophical point of view, it is the result of a qualitative change caused by a quantitative change in the number of electrons in an atom.

The doctrine of the elements, that is, the doctrine of the elements as the simplest constituent parts of all real objects in nature. It has arisen since ancient times, but the modern notion of the elements as a concrete form of matter did not exist in ancient times. Whether in the ancient philosophy of our country, or in the ancient philosophy of India or the West, the element is regarded as an abstract, a manifestation of the primitive spirit, or the basic nature of matter.

Chemical element refers to more than 100 basic metal and non-metal substances in nature, which are composed of only one kind of atom, and each nucleon in its atom has the same number of protons, which cannot be decomposed by ordinary chemical methods, and can constitute all substances. Some examples of common elements are hydrogen, nitrogen, and carbon.

As of 2012, a total of 118 elements have been discovered, 94 of which are found on Earth. Elements with atomic numbers greater than 83 (i.e., after bismuth) are unstable and will undergo radiative decay. The 43rd and 61st elements, i.e., technetium and promethium, have no stable isotopes and undergo decay.

However, even elements with atomic numbers as high as 95 and no stable nuclei can be found in nature, which is the natural decay of uranium and thorium.

According to his position and the general properties of alkaline elements, francium has a slight metallic luster (the lower the metallic luster, the darker it is), a solid state (low melting point), and a very violent reaction when exposed to water, which can be the strongest metallic element.

Symbol fr color may be red (because there is no technology to obtain pure francium, but it should be red in terms of properties and various factors) Properties Soft metal solid (properties of alkali metals) Francium reacts with water to undergo ** (no chemical formula) metallicity Unstable alkali metal.

Episode 6: What are the chemical properties of a substance: This lesson introduces the definition of the chemical properties of a substance through three experiments: "iron rusting", "candle burning", and "copper sulfate reacts with sodium hydroxide". The properties of matter that manifest themselves in chemical changes are called chemical properties.

Reducibility of hydrogen: Hydrogen ignites with oxygen to produce water.

Laboratory preparation of hydrogen: zinc and sulfuric acid are used.

Reducibility of carbon: Carbon is ignited with a sufficient amount of oxygen to produce carbon dioxide.