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.
1. Microsoftâs first Office application was Excel. Originally released under the name Multiplan in 1982, Microsoft changed the name to Excel when releasing it for the Macintosh in 1985. 2. There never was an Excel 1.0 for DOS or Windows. Since Excel was initially launched on the Macintosh, its first release for Windows in 1987 was already version 2.0. 3. For compatibility reasons with Lotus 1-2-3, Microsoft wrongfully set the years 1900, 2100, and 2200 as leap years. This decision would come back to haunt them in the wake of the year 2000.