What is the chemical formula of helium The chemical formula of helium

The chemical formula of helium is HE, which is a monoatomic noble gas molecule.

Helium, atomic number 2, atomic weight, is a noble gas. The name of the element is derived from the Greek word for "sun". In 1868, someone used a spectroscope to observe the surface of the sun, and found a new yellow line, which was thought to belong to an unknown element on the sun, hence the name helium.

Later, when someone used inorganic acid to treat asphalt uranium ore, an inactive gas was obtained, and in 1895, the British scientist Ramsay proved that it was helium by spectroscopy. Helium was later discovered from other ores, air, and natural gas. Helium is found in very small amounts in the Earth's crust, accounting for 23% by mass in the entire universe, second only to hydrogen.

The amount of helium in the air is: There are two natural isotopes of helium: helium-3 and helium-4, and the helium that exists in nature is basically helium-4.

Helium is normally a colorless, odorless gas; melting point at atmospheric pressure), boiling point; density gram liter, critical temperature, critical pressure atmospheric pressure; Solubility in water cm kg water. Helium is the only substance that cannot be solidified at standard atmospheric pressure. When the temperature drops, liquid helium suddenly changes its properties and becomes a superfluid, which can flow upward along the wall of the container, with a thermal conductivity 800 times that of copper, and becomes a superconductor. Its specific heat capacity, surface tension, and compressibility are all abnormal.

Helium is the least reactive element and basically does not form any compounds. The application of helium is mainly as a shielding gas, a working fluid for gas-cooled nuclear reactors, and an ultra-low temperature refrigerant.

The chemical formula of helium is: HE

The Chinese name of helium is hàiqì and the English name is helium, and helium is a noble gas.

It is composed of a single atom and is polymerized by helium atoms to form a molecular weight, and is a colorless, noble gas.

Extremely stable; It glows a dark yellow light when discharged. At room temperature, it is an extremely light colorless, odorless, and tasteless monoatomic gas. Helium is the most difficult of all gases to liquefy and is the only one that cannot be at standard atmospheric pressure.

under the cured substance. Chemical properties of helium.

It is very inactive and difficult to react with other substances in a normal state. The amount in the air is about parts per million. Chemically completely inactive, it does not normally bind to other elements or compounds.

Theoretically, it can be separated and extracted from air, but because its content is too thin, helium is industrially separated and refined from natural gas with a helium content of about 100.

The chemical formula of helium is HE. Helium is a colorless, odorless, odorless, inert gas and is the second lightest gas in nature, after hydrogen. Helium is liquid at room temperature and pressure, and it solidifies into hydrogen at a temperature of degrees Celsius.

Helium is found in very small quantities in nature, but it has a wide range of applications, such as lighting gases, refrigeration gases, gas shielded welding, gas smoking, waxing stoves, etc.

The chemical formula of helium is written as HE, which is colorless and odorless, non-flammable gas, and the content in the air is about parts per million. Chemically inactive, it does not bind to other elements or compounds in a normal state.

The chemical formula of helium is HE, the relative molecular mass is, at room temperature and atmospheric pressure, helium is a colorless, odorless gas. Its volume content in dry air is. It is the substance with the lowest critical temperature that mankind has ever discovered. It is dark yellow when discharged at low voltage.

Helium is a noble gas.

Rare spring ant gas is a group 0 element on the periodic table. At room temperature and pressure, they are all colorless and odorless monoatomic gases, which are difficult to carry out chemical reactions. There are seven noble gases, which are helium (He), neon (Ne), argon (Ar), krypton (Krypton), xenon (Xe), radon (RN, radioactive), and gas (OG, radioactive, man-made element).

1) Condensation method: natural gas helium extraction adopts condensation method in industry, which includes the pretreatment and purification of natural gas, crude helium production and helium refining, etc., to obtain pure helium.

2) Air separation method: Generally, the condensation method is used to extract crude helium and neon mixture from the air device, and pure helium is made from crude helium and neon mixture, and pure helium is prepared by neon mixture after separation and purification.

3) Hydrogen liquefaction method: Hydrogen liquefaction method is used in industry to extract helium from synthetic ammonia tail gas. The process is pure helium prepared by low-temperature adsorption to remove nitrogen, distillation to crude helium oxygenation, catalytic hydrogen removal and helium purification.

4) High-purity helium with ruler rotten method: the pure helium is further adsorbed and purified with activated carbon to produce high-purity helium leakage.

The chemical formula of helium is HE, and helium is widely used in military industry, scientific research, petrochemical, refrigeration, medical, semiconductor, pipeline leak detection, superconducting experiments, metal manufacturing, deep-sea diving, high-precision welding, optoelectronic product production, etc.

At room temperature and atmospheric pressure, helium is a colorless, odorless gas, the chemical formula of helium is HE, and its volume content in dry air is. It is the substance with the lowest critical temperature that mankind has ever discovered. It is dark yellow when the low-voltage finger seepage section is discharged.

Due to the low temperature of liquid helium, when liquid helium is used to cool a metal or metal compound, the resistance of the metal or metal compound will disappear completely, this phenomenon is called superconductivity, and this temperature is called the critical temperature.

Helium is a monoatomic gas and is chemically inactive. Helium generally does not form compounds, and can form He+2, HeH plasma and molecules when excited in a low-voltage discharge tube.

Emergency treatment of helium: In case of leakage, personnel in the leakage contaminated area should be quickly evacuated to the upwind place, and isolated, and the entry of the shouting spine should be strictly restricted. It is recommended that emergency responders wear self-contained positive pressure breathing apparatus and general work clothes.

Cut off the source of the leak as much as possible. Reasonable ventilation to accelerate diffusion. Use immediately if possible.

Leaking containers should be properly disposed of, repaired, and inspected before use.