Lewis Acid-Base Concept. The Lewis theory classifies a substance as an acid if it acts as an electron-pair acceptor and as a base if it acts as an electron-pair donor. Other ways of classifying substances as acids or bases are the Arrhenius concept and the Bronsted-Lowry concept.ewis Acid-Base Concept. The Lewis theory classifies a substance as an acid if it acts as an electron-pair acceptor and as a base if it acts as an electron-pair donor. Other ways of classifying substances as acids or bases are the Arrhenius concept and the Bronsted-Lowry concept.
Microsoft Excel was created by Microsoft Corporation. It was first released in 1985.
The updated version of âThe Insanely Great History of Apple 3.0â was released justafter Apple celebrated its 40th. Founders Steve Jobs, Steve Wozniak and Ronald Wayne created the company on April 1, 1976 as they set about selling computer kits to hobbyists, each of which was hand-built by Wozniak.