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Gilbert Newton Lewis

Died 23 Mar 1946 at age 70 (born 23 Oct 1875). American chemist who collaborated with Irving Langmuir in developing an atomic theory. He developed a theory of valency, which introduced the covalent bond (c. 1916), whereby a chemical combination is made between two atoms by the sharing of a pair of electrons, one contributed from each atom. This was part of his more general octet theory, published in Valence and the Structure of Atoms and Molecules (1923). Lewis visualized the electrons in an atom as being arranged in concentric cubes. The sharing of these electrons he illustrated in the Lewis dot diagrams familiar to chemistry students. He generalized the concept of acids and bases now known as Lewis acids and Lewis bases.«

An Unusual Nativity

A religious education class was almost finished making their models of the nativity scene and one little boy had done a lovely job. Some animals, Mary, Joseph, three wise men, and shepherds were all there. However, the teacher noticed an extra, rather overweight man in the scene as well.“Who is that person?” she asked.“Oh, that’s Round John Virgin.”
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