Valence Electron

Science / Chemistry / Valence Electron: Electrons that can be actively involved in chemical change; usually electrons in the shell with the highest value of n. For example, sodium's ground state electron configuration is 1s2 2s2 2p6 3s1; the 3s electron is the only valence electron in the atom. Germanium (Ge) has the ground state electron configuration 1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p2; the 4s and 4p electrons are the valence electrons.

Valence Shell

Science / Chemistry / Valence Shell: The shell corresponding to the highest value of principal quantum number in the atom. The valence electrons in this shell are on average farther from the nucleus than other electrons; they are often d MORE

Equivalence Point

Science / Chemistry / Equivalence Point: The equivalence point is the point in a titration when enough titrant has been added to react completely with the analyte. MORE


Business / Agriculture / Equivalence: A term applied by the Uruguay Round Agreement on the Application of Sanitary and Phytosanitary (SPS) Measures. WTO Member countries shall accord acceptance to the SPS measures of other countries (even MORE