Molecular Geometry and Electron Pair Geometry refined

This set of flashcards covers key terms and definitions related to molecular geometry and electron pair arrangements in chemistry.

Electron-Pair Geometry

The arrangement of electron pairs around a central atom, considering both bonding pairs and lone pairs.

Linear

2 bonding pairs, 0 lone pairs. Angle = 180^\circ.

Trigonal Planar

3 bonding pairs, 0 lone pairs. Angle = 120^\circ.

Tetrahedral

4 bonding pairs, 0 lone pairs. Angle = 109.5^\circ.

Trigonal Bipyramidal

5 bonding pairs, 0 lone pairs. Angles = 120^\circ (equatorial) and 90^\circ (axial).

Octahedral

6 bonding pairs, 0 lone pairs. Angle = 90^\circ.

Lone Pairs

Pairs of valence electrons that are not involved in bonding and can influence molecular geometry.

Bent

2 bonding pairs, 1 lone pair (angles <120^\circ) or 2 bonding pairs, 2 lone pairs (angles <104.5 )

Seesaw

4 bonding pairs, 1 lone pair. Angles: axial <90^\circ and equatorial <120^\circ.

Square Pyramidal

5 bonding pairs, 1 lone pair. Angles: <90^\circ.

Square Planar

4 bonding pairs, 2 lone pairs. Angle = 90^\circ.

Trigonal Pyramidal

3 bonding pairs, 1 lone pair. Angles <109.5^\circ.

T-shaped

3 bonding pairs, 2 lone pairs. Angles: axial <90^\circ.