isomerism

12 ENTRIES FOUND:

isom·er·ism

noun \ī-ˈsä-mə-ˌri-zəm\

Definition of ISOMERISM

1
:  the relationship of two or more chemical species that are isomers
2
:  the relation of two or more nuclides with the same mass numbers and atomic numbers but different energy states and rates of radioactive decay

First Known Use of ISOMERISM

1838

isom·er·ism

noun \ī-ˈsäm-ə-ˌriz-əm\   (Medical Dictionary)

Medical Definition of ISOMERISM

1
: the relation of two or more chemical species that are isomers
2
: the relation of two or more nuclides with the same mass numbers and atomic numbers but different energy states and rates of radioactive decay

isomerism

noun    (Concise Encyclopedia)

Existence of sets of two or more substances with identical molecular formulas (see chemical formula) but different configurations and hence different properties. Jons Jacob Berzelius was the first to recognize and name it (1830). In constitutional (structural) isomerism, the molecular formula and molecular weight of the substances are the same, but their bonding differs. For example, CHO is the molecular formula for both ethanol (CHCHOH) and methyl ether (CHOCH). Constitutional isomers that can be readily converted from one to another are called tautomers (see tautomerism). In stereoisomerism, substances with the same atoms are bonded in the same ways but differ in their three-dimensional configurations. See also isomer.

Browse

Next Word in the Dictionary: isomerize
Previous Word in the Dictionary: isomeric
All Words Near: isomerism

Seen & Heard

What made you want to look up isomerism? Please tell us where you read or heard it (including the quote, if possible).