VSEPR Theory

Valence Shell Electron Pair Repulsion predicts molecular shapes.

Short definition

Valence Shell Electron Pair Repulsion predicts molecular shapes.

Full explanation

VSEPR Theory in the context of molecular geometry forces: Valence Shell Electron Pair Repulsion predicts molecular shapes. In practice this means relating macroscopic observation (mass, pressure, color), particle-level picture (atoms, electrons, ions moving and rearranging), and symbolic representation (formulas, equations, units). For VSEPR Theory, students connect the definition to linked lessons: do not just memorize the phrase — predict what changes when conditions change and check with dimensional analysis.

Notation and units

• Notation: AXmEn
• Common units: SI or derived, temperature in kelvins when in gas/energy contexts.
• Symbolic hint: See related formula if applicable.

Example

Example for vsepr theory: In a worked problem where this term appears, substitute measured values with correct units and check that the dimensional result matches the intended quantity. For instance, calculating a vsepr theory often uses the form $n=m/M$ or $c=n/V$ or $PV=nRT$ with $T$ in kelvins — illustrating how vsepr theory leads to a numerically different but dimensionally correct result when units are handled.

Confused with

• Orbital Hybridization — distinction: VSEPR Theory is valence shell electron pair repulsion predicts molecular shapes. while Orbital Hybridization has a different defining property. See cross-link in glossary.

Related resources

• Topic: molecular-geometry-forces
• Formula library — when a specific equation involves this term it is linked.
• Constants — if a constant is required, it is sourced and versioned (NIST 2022).

Sources

• NIST Physical Constants 2022 (nist-2022, CODATA 2022). Accessed 2026-08-21.

Last reviewed: 2026-08-21 — Review due: 2027-08-21 — Author: Chemistry Fundamentals Editorial Team — Reviewer: Editorial Review Board (transparent placeholder).

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