<![CDATA[Students face difficulties visualizing abstract molecular geometry concepts because current teaching materials lack 3D modeling support. To overcome this, this research aims to develop a valid, practical, and effective Google Sites-based e-module for learning molecular geometry. This study applied the Research and Development (R&D) method using Thiagarajan's 4D model. Data collection instruments included expert validation questionnaires, teacher perception surveys, student response questionnaires, pretest-posttest assessments, and learning observation sheets. The e-module's feasibility was assessed by expert lecturers and chemistry teachers. Practicality data were gathered through chemistry teachers' perceptions, observer sheets, and questionnaires from 31 eleventh-grade students. Effectiveness data were collected involving the same 31 eleventh-grade subjects. Expert validation results showed average percentage s of 87.73% for media and 86.5% for material, indicating the e-module is valid with "very high" criteria. During the limited trial phase, teacher and student perceptions scored 90.5% and 85.73%, demonstrating the e-module's practicality with "very high" criteria. The product's effectiveness in learning is evidenced by an average student N-gain score of 0.54 (moderate category). Based on these results, the developed e-module is declared feasible, practical, and effective for use as an educational medium.]]>
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