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.
Interview: Steve Wozniak, Co-Founder, Apple Computer If any one person can be said to have set off the personal computer revolution, it might be Steve Wozniak. He designed the machine that crystallized what a desktop computer was: the Apple II. Wozniak and Steve Jobs founded Apple Computer in 1976. Between Wozniak's technical ability and Jobs's mesmerizing energy, they were a powerful team. Woz first showed off his home-built computer, the Apple I, at Silicon Valley's Homebrew Computer Club in 1976.