VSEPR Theory and Molecular Geometry

These flashcards cover the key concepts related to VSEPR theory, molecular geometry, and how to represent 3D structures of molecules.

What is VSEPR Theory?

Valence Shell Electron Pair Repulsion Theory, which predicts the 3D shape of molecules based on electron pairs surrounding a central atom.

How do electron pairs behave according to VSEPR Theory?

Electron pairs repel each other and terminal atoms orient themselves as far apart as possible.

What does the 'A' in AXE notation represent?

The central atom.

In AX3E, what does 'E' refer to?

One lone pair of electrons.

What is the molecular shape of a molecule with 2 electron domains and 0 lone pairs?

Linear.

What is the molecular shape of AX3 with 3 bonds and 0 lone pairs?

Trigonal Planar.

What does AX2E represent?

A molecule with 2 bonds and 1 lone pair, resulting in a bent shape.

What is the shape of AX4?

Tetrahedral.

What does a wedge symbol represent in 3D molecular drawings?

An atom coming forward, in front of the plane of the paper.

What does a dash symbol represent in 3D molecular drawings?

An atom going backward, behind the plane of the paper.

What is the molecular shape of NH3?

Trigonal Pyramid.

Name a molecule that has a linear shape and is represented as AX2. What does this entail?

CO2; it has 2 bonds and 0 lone pairs.