Valence

Science / Chemistry / Valence: The number of hydrogen atoms that typically bond to an atom of an element. For example, in H2O, oxygen has a valence of 2; carbon in CH4 has a valence of four.

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; th MORE

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

Ambivalence

Science / Psychiatry / Ambivalence: The coexistence of contradictory emotions, attitudes, ideas, or desires with respect to a particular person, object, or situation. Ordinarily, the ambivalence is not fully conscious and suggests psyc MORE

Valence Bond

Science / Chemistry / Valence Bond: In the valence bond theory, a valence bond is a chemical bond formed by overlap of half-filled atomic orbitals on two different atoms. MORE

Equivalence

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

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