Writing Electron Dot Structures
Kenneth R. Magnell Department of Chemistry, Central Michigan University, Mt. Pleasant MI 48859
Note:	This program is included in the General Chemistry Collection (SP-16). To Order General Chemistry Collection
Writing Electron Dot Structures is a computer program for Mac OS that provides drill with feedback for students learning to write electron dot structures. While designed for students in the first year of college general chemistry it may also be used by high school chemistry students. A systematic method similar to that found in many general chemistry texts is employed: determine the number of valence shell electrons, select the central atom, construct a skeleton, add electrons to complete octets, examine the structure for resonance forms. Screens from Writing Electron Dot Structures. During the construction of a structure, the student has the option of quitting, selecting another formula, or returning to a previous step. If an incorrect number of electrons is entered the student may not proceed until the correct number is entered. The symbol entered for the central atom must follow accepted upper/lower case practice, and entry of the correct symbol must be accomplished before proceeding to the next step. A periodic table is accessible and feedback provides assistance for these steps. Construction of the skeleton begins with the placement of the central atom. Atoms can be added, moved, or removed. Prompts and feedback keep the student informed of progress and problems. A correct skeleton is required before proceeding to the next step. Completion of the structure begins with the addition of electron pairs to form the required bonds. Remaining electrons are added to complete the formation of multiple bonds, assure compliance with the octet rule, and form expanded octets. Resonance forms are made by moving or removing and replacing electron pairs in the existing skeleton. Prompts and feedback guide the student through this process. A running tally of bond pairs, unshared pairs, octets, electrons used, and electrons remaining is provided during this step. Hardware and Software Requirements Computer CPU RAM Drives Free Disk Space Graphics Operating  System Mac OS compatible  Power Macintosh or 68030 or higher  16 MB Hard Drive, High-density (1.44MB) floppy drive 3 MB color monitor,  256 colors, 640 x 480 System 7.6.1 or higher Availability Available: Now

First Published: November 99

Citation: Magnell, K. R. Writing Electron Dot Structures J. Chem. Educ. Software 999905

Keywords: Lecture Aid; Computer Room; High School; General; Electron Dot Structures

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