This research aims to develop an electronic module based on guided discovery learning for class X senior high school students, as well as determine the level of validity and the practicality of the developed e-module molecule shape. The e-module development is carried out through the plomp development model stage which consists of 3 stages, namely the preliminary research stage, the prototyping phase, and the assessment phase. The assessment instrument used was a questionnaire to determine the level of validity and practicality of the emodule. To calculate the validity of the e-module using the Aiken's v formula, the content validity value was 0.85 in the valid category, while for technical validity it was 8.86 with the valid category. For the calculation of the practicality level of the e-module by the teacher, the practicality value was 89.46% with the very practical category and the practicality test results by the students was 87.6% with the very practical category

Keywords : E-Module; Molecular Shape; Guided Discovery Learning; Plomp Development Model