Electron-Pair and Molecular Geometries

Vocabulary flashcards detailing electron-pair geometries, lone pairs on the central atom, molecular geometries, and ideal bond angles.

Linear (2 regions, 0 lone pairs)

A geometry characterized by 2 electron regions, an electron-pair geometry of linear, 0 lone pairs on the central atom, a molecular geometry of linear, and an ideal angle of $180^\circ$.

Trigonal planar (3 regions, 0 lone pairs)

A geometry characterized by 3 electron regions, an electron-pair geometry of trigonal planar, 0 lone pairs on the central atom, a molecular geometry of trigonal planar, and an ideal angle of $120^\circ$.

Bent (3 regions, 1 lone pair)

A geometry characterized by 3 electron regions, an electron-pair geometry of trigonal planar, 1 lone pair on the central atom, a molecular geometry of bent, and an ideal angle of $<120^\circ$.

Tetrahedral (4 regions, 0 lone pairs)

A geometry characterized by 4 electron regions, an electron-pair geometry of tetrahedral, 0 lone pairs on the central atom, a molecular geometry of tetrahedral, and an ideal angle of $109.5^\circ$.

Trigonal pyramidal

A geometry characterized by 4 electron regions, an electron-pair geometry of tetrahedral, 1 lone pair on the central atom, a molecular geometry of trigonal pyramidal, and an ideal angle of $\sim 107^\circ$.

Bent (4 regions, 2 lone pairs)

A geometry characterized by 4 electron regions, an electron-pair geometry of tetrahedral, 2 lone pairs on the central atom, a molecular geometry of bent, and an ideal angle of $\sim 104.5^\circ$.

Trigonal bipyramidal (5 regions, 0 lone pairs)

A geometry characterized by 5 electron regions, an electron-pair geometry of trigonal bipyramidal, 0 lone pairs on the central atom, a molecular geometry of trigonal bipyramidal, and ideal angles of $90^\circ$, $120^\circ$, and $180^\circ$.

Seesaw

A geometry characterized by 5 electron regions, an electron-pair geometry of trigonal bipyramidal, 1 lone pair on the central atom, a molecular geometry of seesaw, and ideal angles of $<90^\circ$, $<120^\circ$, and $180^\circ$.

T-shaped

A geometry characterized by 5 electron regions, an electron-pair geometry of trigonal bipyramidal, 2 lone pairs on the central atom, a molecular geometry of T-shaped, and ideal angles of $\sim 90^\circ$ and $180^\circ$.

Linear (5 regions, 3 lone pairs)

A geometry characterized by 5 electron regions, an electron-pair geometry of trigonal bipyramidal, 3 lone pairs on the central atom, a molecular geometry of linear, and an ideal angle of $180^\circ$.

Octahedral (6 regions, 0 lone pairs)

A geometry characterized by 6 electron regions, an electron-pair geometry of octahedral, 0 lone pairs on the central atom, a molecular geometry of octahedral, and ideal angles of $90^\circ$ and $180^\circ$.

Square pyramidal

A geometry characterized by 6 electron regions, an electron-pair geometry of octahedral, 1 lone pair on the central atom, a molecular geometry of square pyramidal, and ideal angles of $<90^\circ$ and $180^\circ$.

Square planar

A geometry characterized by 6 electron regions, an electron-pair geometry of octahedral, 2 lone pairs on the central atom, a molecular geometry of square planar, and ideal angles of $90^\circ$ and $180^\circ$.