An atom or molecule with an unpaired electron. Radical, also called Free Radical, in chemistry, molecule that contains at least one unpaired electron. I read somewhere that radicals are atoms, molecules or ions that have unpaired electrons, but how do ions have unpaired electrons when an ion has all its electrons paired either by loosing or gaining electrons to attain the nearest noble gas configuration? Radicals are usually formed when a single covalent bond breaks to leave an unpaired electron on each of the two species created by the bond breaking: this is called homolysis. A radical is a chemical species that contains an unpaired electron. Most molecules contain even numbers of electrons, and the covalent chemical bonds holding the atoms together within a molecule normally consist of pairs of electrons jointly … share. Each bonding or non-bonding electron pair has two electrons which are in opposite spin orientation, +1/2 and -1/2 in one orbital based on Pauli’s exclusion principle, where as an unpaired electron is a single electron , alone in one orbital. Generally, molecules bear bonding electron pairs and lone pairs a non-bonding electron pair or un-shared electron pair. All the radicals share some of the common properties due to the unpaired electron.

Most molecules contain even numbers of electrons, and the covalent chemical bonds holding the atoms together within a molecule normally consist of pairs of electrons jointly … Share a link to … In chemistry, a radical (more precisely, a free radical) is an atom, molecule, or ion that has unpaired valence electrons or an open electron shell, and therefore may be seen as having one or more "dangling" covalent bonds. radicals. Radical, also called Free Radical, in chemistry, molecule that contains at least one unpaired electron. A molecule that has an unpaired electron is called a free radical and is a para magn… Because they have a free electron, such molecules are highly reactive.

In chemistry, radicals (often referred to as free radicals) are atomic or molecular species with unpaired electrons on an otherwise open shell configuration. In the past such species were often called "free radicals".