ABE Notation: Understanding Shape and Bond Angles in Geometry

AB2

Linear; 180°; sp

ABE

Linear; 180°; sp

AB3

Trigonal planar; 120°; sp2

AB2E

Bent/angular; < 120°; sp2

AB4

Tetrahedral; 109.5°; sp3

AB2E2

Bent/angular; <109.5°; sp3

AB3E

Trigonal pyramidal; <109.5°; sp3

ABE3

Linear; 180°; sp3

AB5

Trigonal bipyramidal; 120° and 90°; sp3d

AB4E

Seesaw; <90° and <120°; sp3d

AB3E2

T-shaped; <90°; sp3d

AB2E3

Linear, 180°; sp3d

AB6

Octahedral; 90°; sp3d2

AB5E

Square pyramidal; <90°; sp3d2

AB4E2

Square planar; 90°; sp3d2

Trigonal

Refers to triangular shape

Hedral

Refers to # of surfaces

Planar

Flat

A in ABE notation represents...

the central atom

B in ABE represents...

the # of atoms the CENTRAL ATOM is bonded to

E in ABE represents...

the # of unshared (or lone) electron PAIRS on the CENTRAL atom