Lewis, Gilbert acid-base theory

A third definition is based on the valance electron structures developed by Gilbert N. Lewis and does not involve the components of water. The Lewis definition states that substances that can accept electrons in an aqueous solution are acids, and substances that can donate electrons in an aqueous solution are bases. We will revisit Lewis s acid-based theory in Lesson 15, Acid and Bases. ... 

Equations (7) and (8) can also be explained by American chemist Gilbert Lewis s acid-base theory. A Lewis acid is a substance that can accept a pair of electrons to form a new bond, and a Lewis base is a substance that can donate a pair of electrons to form a new bond. 

In 1923, the same year that Bransted and Lowry came up with their idea of what acids and bases were, an American chemist named Gilbert Newton Lewis began to work on his own acid-base theory. Lewis defined acid as any substance that accepted an electron pair. A base, on the other hand, is any substance that donates an electron pair. 

The final acid-base theory that we shall consider was proposed by chemist Gilbert Lewis in the early 1920s. The Lewis Theory is the most general, including more substances under its definitions than the other theories of acids and bases. A Lewis acid is a substance that accepts a pair of electrons to form a covalent bond. A Lewis base is a substance that provides a pair of electrons to form a covalent bond. In order for a substance to act as a Lewis base, it must have a pair of unshared electrons in its valence shell. An example of this is seen when a hydrogen ion attaches to the unpaired electrons of oxygen in a water molecule, as shown here ... 

In the early 1930s Gilbert Lewis, an American chemist, proposed a more general acid-base theory that is based on sharing electron pairs rather than... 

This classification was still not qrrite satisfadory for American chemist Gilbert Lewis (1875-1946)—or at least one corrld irrragine this had he not published his thoughts in the same year as Bronsted arrd Lowry (1923). Lewis notion was that hydrogen is present in many substances, but not all of them, whereas electrons are present in every substance. So, in the Lewis acid-base theory, electrons (or electron pairs, to be more precise) play central roles. In this theory a molectrle that can accept an electron pair plays the role of an acid. Conversely, a base can donate an electron pair ... 

In the same year that Bronsted and Lowry proposed their definition of acids and bases, an American chemist named Gilbert Lewis proposed an alternative definition that not only encompassed Bronsted-Lowry theory but also accounted for acid-base reactions in which a hydrogen ion isn t exchanged. Lewis s definition relies on tracking lone pairs of electrons. Under his theory, a base is any substance that donates a pair of electrons to form a coordinate covalent bond with another substance, while an acid is a substance that accepts that electron pair in such a reaction. As we explain in Chapter 5, a coordinate covalent bond is a covalent bond in which both of the bonding electrons are donated by one of the atoms forming the bond. 

LEWIS, GILBERT N. 11875-1946). An American chemist, native of Massachusetts, professor of chemistry at MIT from 1905 to 1912 after which he became dean of chemistry at the University of California at Bcikeley. His inosi creative contribution was the eleciroh-pair theory of acids and bases, which laid the groundwork lor coordination chemistry. He was also a leading authority on thermodynamics. 

Lewis, Gilbert N. (1875-1946). Proposed electron-pair theory of acids and bases authority on thermodynamics. 

The American chemist Gilbert Lewis (1875-1945) introduced his electronic theory of acid-base interactions in 1924. 

A more general concept of acids and bases was introduced by Gilbert N. Lewis. The Lewis theory deals with the way in which a substance with an unshared pair of electrons reacts in an acid-base type of reaction. According to this theory, a base is any substance that has an unshared pair of electrons (electron pair donor), and an acid is any substance that will attach itself to or accept a pair of electrons. 

Lewis, Gilbert Newton (1875-1946) American physical chemist who developed theories on chemical thermodynamics, atomic structure, and atomic bonding. He pioneered work on the electronic theory of valency, showing the difference between ionic and covalent bonds. He defined an acid as an electron acceptor and a base as an electron donor. 

Gilbert N. Lewis recognized the similarity in behavior of boron tri-fiuoride and a transferred proton toward a base, and in 1923 enunciated a definition of acid-base reaction in terms of sharing of an electron pair—fl base donates an electron pair in covalent bonding and an acid accepts the pair. The acid is called an ELECTROPHILE, and the base is called a nucleophile. In the base, the atom with the unshared pair of electrons is an electron-rich site, and, in the acid, the atom that accepts the pair of electrons to form a covalent bond is an electron-deficient site. The Lewis theory focuses attention on the electron pair rather than on the proton, and in so doing broadens the concept of acidity. The transferred proton of a so-called Brbnsted acid is a special case of a Lewis acid. 

A further generalization of the idea of acids and bases was the Lewis theory put forward, also in 1923, by the US physical chemist Gilbert Newton Lewis (1875-1946). In this, an acid (a Lewis acid) is a compound that can accept a pair of electrons and a base (a Lewis base) is one that donates a pair of electrons. In a traditional acid-base reaction, such as ... 

LEWIS ELECTRON THEORY. A theory involving acid and base formation, neutralization, and related phenomena on the basis of exchange of electrons between substances and the formation of coordinate bonds. It represented an important advance in chemical theory. largely replacing earlier concepts. Advanced in 1923 by Gilbert N Lewis, it contributed much to the development of coordination chemistry- in which the base is represented by the ligand and the acid by the metal ion. 

Gilbert Newton Lewis described covalent bonds as sharing electrons in the 1910s and the electron pair donor/acceptor theory of acids and bases in the... 

Gilbert N. Lewis (1875-1946) introduced the theory of the electron pair that extended our understanding of covalent bonding and of the concept of acids and bases. It is in his honor that we often refer to an "electron dot" structure as a Lewis structure. 

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