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.
Best Answer: Word was released for Xenix and DOS in 1983, Macintosh in 1984, and then Windows when it came out in 1989. Excel was released for Macintosh first in 1985, then Windows in 1987. PowerPoint was first released in 1987, by a company that Microsoft bought up soon after the initial release. Source(s):