Helium

Chemical element of symbol He, belonging to group 18 of the periodic table, of atomic number 2 and atomic mass 4.0026. It is the second most abundant element in the universe. It appears as a colorless, odorless and tasteless monatomic gas. It is very light and the most difficult element to liquefy. Subcooled liquid helium presents the phenomenon of superfluidity and a multiplied thermal conductivity. Chemically it is an inert element, the least reactive of all noble gases.

Helio Helium

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Chemical Glossary Terms

Chemical Terms begining with H

Hafnium

Chemical element of symbol Hf, belonging to group 4 of the periodic table, of atomic number 72 and a...

Halogens

Family of elements belonging to group VIIA of the periodic table. They form salts with the alkaline ...

Haluros

Binary combinations of a halogen with more electropositive elements. They can be divided into two gr...

Hassio

Chemical element of symbol Hs, belonging to group 8 of the periodic table, of atomic number 108. It ...

Helium

Chemical element of symbol He, belonging to group 18 of the periodic table, of atomic number 2 and a...

Heptane

Alkano of seven carbon atoms, present in the oil and has different chain isomers. It is used togethe...

Heterogeneous.

Term that applies to systems in which there are several phases. A heterogeneous system is not consid...

Hybridization

Combination of atomic orbitals of different types, although of similar energies and with wide possib...

Hydration

Combination of water molecules with ions or polar molecules of the solute in the dissolution process...

Hydrate

Chemical compound that presents water molecules in its structure. The water molecules can be linked ...

Hydrocarbons

Organic compounds that only contain carbon and hydrogen atoms. The main types are alkanes, alkenes, ...

Hydrogenation

Reaction of addition of a hydrogen molecule to a carbon-carbon multiple bond in the presence of meta...

Hydrogen

Chemical element of symbol H, belonging to group 1 of the periodic table, of atomic number 1 and ato...

Hydrolysis

Chemical reaction of a compound with water in which the compound tends to dissociate. In the case of...

Hydroxide (hydro- + oxide).

Alkali or base. Compound that contains one or more hydroxyl groups in its molecule, eg. NaOH and Ca ...

Hydroxyl (hydro- + oxy- + -yl).

Radical monovalent composed of an oxygen atom and a hydrogen atom: OH-. It comes from hydrogen perox...

Hydride

Compound formed by hydrogen and a metal. For example, lithium hydride (LiH). In hydrides, hydrogen h...

Hydrides

Binary combinations of hydrogen with another element. There are three types: saline or ionic hydride...

Iron

Chemical element of Fe symbol, belonging to group 8 of the periodic table, atomic number 26 and atom...

Holmio

Chemical element of symbol Ho, belonging to the series of lanthanides, of atomic number 67 and atomi...

Hormone

Organic substance with specific action on the function of certain tissues. They are produced by glan...

Helium

Chemical Glossary Terms

Chemical Terms begining with H

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