Two or more substances that have identical molecular formulas but different molecular structures or configurations, and hence different properties, are called isomers. Isomers differ only in the arrangement of their component atoms.

In this case, one specific arrangement of chlorine molecules in a homologous group, e.g. 2,3,7,8-TCDD is one isomer of the TCDD group. 2,4,7,8-TCDD would be another isomer of the same group.

Chemical compounds that contain the same number and kind of atoms, but arranged differently. During the wort boil, humulone in hops isomerizes to the more soluble isohumulone that releases the hop bitterness.

structural isomer. Molecules with identical molecular formulas but different structural formulas.

Compounds with the same formula but different properties are said to be isomers. There are two broad categories: Same atoms, different bonds: structural isomers Same atoms, same bonds, different spatial arrangements: stereoisomers

Chemical compounds with the same composition but different shapes.

Compounds that have the same molecular formula, but have different structures.

compound having the same molecular formula as another compound, but having a different structural formula. (see geometric isomer, optical isomer, positional isomer, sterioisomer, structural isomer)

One of two or more forms a chemical compound which have the same number and type of each atom but a different arrangement of atoms.

One of several chemical compounds which have the same empirical formula but different chemical structures and to some extent also different chemical, physical or biological properties.

a compound that exists in forms having different arrangements of atoms but the same molecular weight

a chemical molecule having a slightly different structure from another molecule, but being identical with it in terms of its chemical elements and weight

a chemical substance with the same atoms arranged in a slightly different fashion with a resultant change in its chemical function

a molecule containing identical atoms to another molecule but arranged as a mirror image

a molecule that has the same atoms as another, but is arranged a little differently

a variation in the arrangement of atoms in two or more otherwise similar chemical compounds

Isomers are different forms of the same chemical compound, being made up of the same number and composition of atoms, but in different arrangements. Each isomer can have a slightly different properties.

A compound having the same percentage composition and molecular weight as another compound but differing in chemical or physical properties. Isomers may differ in the manner in which constituent atoms are linked or are arranged in space.

Compounds with the same composition and molecular weight, but differing structure are said to be isomers.

When two molecules have the same elemental composition but different structures, they are said to be isomers.

Any of two chemical substances composed of the same elements in the same proportions but with different structures and different properties. Dioxins and PCBs have many isomers. Similar to cogener.

Molecules with the same chemical formula (i.e., same number of atoms of a given type), but in which atoms are arranged differently.

Chemical composition of a substance that has the same chemical formula, but a difference arrangement of their atoms. Back to glossary index

One of several nuclides with the same number of neutrons and protons capable of existing for a measurable time in different nuclear energy states.

One of two or more different compounds having the same molecular formula.

Diamond is one of the isomers of carbon. Isomers are molecules which have the same molecular formulae but different molecular structures.

In chemistry, isomers are the compounds that have identical molecular formulas but differ in the nature or sequence of bonding of their atoms or in the arrangement of their atoms in space. In physics, isomers are the nuclei of the same atomic number and mass number but in different energy states.

Having the same number of atoms of each element as another molecule. Back to .

One of two or more compounds, radicals, or ions that contain the same number of atoms of the same elements but differ in structural arrangement and properties.

one of two or more compounds composed of the same percentage of elements but differing in structure and properties.

Nuclides with the same number of neutrons and protons in different states of excitation.

One of two or more compounds that have the same chemical formula but different arrangements of the atoms within the molecules and that may have different physical/chemical properties.

Organic compounds of identical composition and molecular weight, but having a different molecular structure.

Compounds containing the same elements in the same proportions which can exist in more than one structural form; e.g. geometric, positional or cyclic.

Chemical compound where the overall composition of the molecule is the same but the structure is different.

A material with the same chemical composition (i.e. kind and number of elements) as another material but with a different arrangement of those elements. For example, n-butyl alcohol and t-butyl alcohol are isomers of one another.

In chemistry, isomers are molecules with the same chemical formula and often with the same kinds of bonds between atoms, but in which the atoms are arranged differently. That is to say, they have different structural formulae. Many isomers share similar if not identical properties in most chemical contexts.