Dictionary > Valence electron

Valence electron

Definition
noun, plural: valence electrons
Any of the electrons on the outermost shell of an atom and takes part in chemical reactions
Supplement
In chemistry and biochemistry, a valence electron pertains to any of the electrons on the outer shell of the nucleus of an atom. It is capable of interacting with other atoms, i.e. by transferring to another atom or by sharing and forming chemical bonds. In a single covalent bond for instance, each of the two atoms shares a valence electron and form a bond.
The valence electrons of an atom accounts for the properties of an element. Based on its valence, it can be determined if the element is capable of bonding with another element and up to what extent, i.e. if it would lose or gain an electron and form an ion or if it would rather share electrons and form bonds.
Valence electron is capable of absorbing and releasing energy (in the form of a photon). The photon is the quantum unit of light energy or electromagnetic radiation. Photons are emitted as electrons move from one energy state to another, and when it is emitted via a biological system, it is referred to as a biophoton. This is what occurs in organisms capable of bioluminescence. In photosynthesis, photons that are absorbed by the chlorophyll reaction centers (e.g. P680) trigger the latter to become an electron donor.
See also:


You will also like...

primitive arthropods
Arthropods

The arthropods were assumed to be the first taxon of species to possess jointed limbs and exoskeleton, exhibit more adva..

Balanced Diet
A Balanced Diet – Minerals and Proteins

Proteins and minerals can be derived from various dietary sources. They are essential for the proper growth and developm..

Endemic Flora of New Zealand
New Zealand’s Unique Flora

If New Zealand has lots of unique animals, it's also got a whole lot of unique plants. Find out more about some of them,..

human respiratory system
Respiration

The human respiratory system is an efficient system of inspiring and expiring respiratory gases. This tutorial provides ..

Gibberellins and Gibberellic Acid
Gibberellins and Gibberellic Acid

This tutorial describes the role of gibberellin family in plants. Find out the effects of gibberellin on plant growth an..

human brain structure
The Conscious & Unconscious Nervous System

This tutorial elaborates on how the nervous system works, particularly at the tissue level of the brain. There are three..