STEM PRACTICE AND EVIDENCE WORKBENCH
Map supplied central-atom electron domains to bounded VSEPR geometries and audit electron and molecular labels separately.
Review output
Load the worked example to inspect realistic inputs, or enter anonymous classroom or laboratory evidence. Results remain in this browser tab until you copy or download them.
Transparent method
Total electron domains equal bonding domains plus central-atom lone pairs; multiple bonds count as one domain in VSEPR. A bounded lookup maps total domains to electron geometry and removes lone-pair positions to name molecular geometry. Both learner labels must match for the row to be supported. Supported means the supplied counts lead to both entered geometry labels under the implemented VSEPR map. The result is only as reliable as the Lewis structure and domain coding. Review resonance, formal charge, equivalent positions, lone-pair placement, distortions, experimental geometry, bond-angle ranges, and how shape contributes to molecular polarity.
Confirm the question, source, units, notation, response coding, model assumptions, and review threshold. Keep an unchanged copy of the original evidence.
Run the worked example, inspect every intermediate row, and compare it with a hand calculation, diagram, representation, or approved subject method.
Record the method, assumptions, units, classifications, and flagged rows. Verify the editable report independently before educational or laboratory use.
How to interpret the result
Use when learners need to distinguish electron-domain geometry from the arrangement of bonded atoms. The workbench covers common two-through-six-domain central-atom cases. It does not build Lewis structures, infer lone pairs, evaluate resonance, handle every hypervalent exception, calculate exact bond angles, model multiple centers, or determine polarity automatically.
Carbon dioxide has two bonding domains and no lone pairs, giving linear electron and molecular geometry. Boron trifluoride gives trigonal planar for both. Water has four total domains, so electron geometry is tetrahedral while molecular geometry is bent. Ammonia is also tetrahedral by electrons, making the entered trigonal-planar electron label incorrect.
Total electron domains equal bonding domains plus central-atom lone pairs; multiple bonds count as one domain in VSEPR. A bounded lookup maps total domains to electron geometry and removes lone-pair positions to name molecular geometry. Both learner labels must match for the row to be supported.
Supported means the supplied counts lead to both entered geometry labels under the implemented VSEPR map. The result is only as reliable as the Lewis structure and domain coding. Review resonance, formal charge, equivalent positions, lone-pair placement, distortions, experimental geometry, bond-angle ranges, and how shape contributes to molecular polarity.
Do not count double bonds as two domains, confuse electron geometry with molecular geometry, include terminal-atom lone pairs in the central count, call water tetrahedral molecular geometry, infer three-dimensional shape from formula alone, or treat ideal labels as exact measured angles. Draw domains and mark lone pairs before naming shape.
Learning boundary
This browser-local workbench applies only the disclosed rules. It cannot diagnose a learner, certify an experiment, or replace teacher, laboratory, and safety judgment.
Review checklist
Practical questions
No. Processing occurs in the current browser tab. Avoid personal information and retain authoritative records only in the approved school system.
No. It describes entered evidence under one disclosed rule. Review reasoning, uncertainty, access, and several evidence sources.
Treat it as an editable calculation aid. Show your own reasoning, cite required sources, and follow course and academic-integrity rules.
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