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.
Confidence votes 2.4K. The Rubik's cube was invented by Erno Rubik for a reason, it wasn't invented as a toy. He invented to teach the 3 dimensions of objects to his students at Budapest Colledge, as a proffessor in achitecture.nd it was at that moment that I came face to face with  the Big Challenge: What is the way home? - Erno Rubik  That was how the Cube as a puzzle, was invented in the spring of  1974, when the twenty-nine year old Rubik discovered it was not so  easy to realign the colors to match on all six sides.