VESPR (VALENCE ELECTRON SHELL PAIR REPULSION)

LINEAR NUMBER OF ELECTRON DOMAINS

AX^2 (2)

TRIGONAL PLANAR NUMBER OF ELECTRON DOMAINS

AX^3 (3)

BENT NUMBER OF ELECTRON DOMAINS WITH ONE LONE PAIR

AX^2 E^1 (3)

TETRAHEDRAL NUMBER OF ELECTRON DOMAINS

AX^4 (4)

TRIGONAL PYRAMIDAL NUMBER OF ELECTRON DOMAINS

AX^3 E^1 (4)

BENT NUMBER OF ELECTRON DOMAINS WITH TWO LONE PAIRS

AX^2 E^2 (4)

TRIGONAL BIPYRAMIDAL NUMBER OF ELECTRON DOMAINS

AX^5 (5)

SEESAW NUMBER OF ELECTRON DOMAINS

AX^4 E^1 (5)

T SHAPED NUMBER OF ELECTRON DOMAINS

AX^3 E^2 (5)

LINEAR NUMBER OF ELECTRON DOMAINS WITH 3 LONE PAIRS

AX^2 E^3 (5)

OCTAHEDRAL NUMBER OF ELECTRON DOMAINS

AX^6 (6)

SQUARE PYRAMIDAL NUMBER OF ELECTRON DOMAINS

AX^5 E^1 (6)

SQUARE PLANAR NUMBER OF ELECTRON DOMAINS

AX^4 E^2 (6)

LINEAR AX^2 BOND ANGLE

90

TRIGONAL PLANAR AX^3 BOND ANGLE

120

BENT AX^2 E^1 BOND ANGLE

<120

TETRAHEDRAL AX^4 BOND ANGLE

109.5

TRIGONAL PYRAMIDAL AX^3 E^1 BOND ANGLE

<109.5

BENT AX^2 E^2 BOND ANGLE

<109.5

TRIGONAL BIPYRAMIDAL AX^5 BOND ANGLE

90, 120

SEESAW AX^4 E^1 BOND ANGLE

<90, <120

T SHAPED AX^3 E^2 BOND ANGLE

<90

LINEAR AX^2 E^3 BOND ANGLE

180

OCTAHEDRAL AX^6 BOND ANGLE

90

SQUARE PYRAMIDAL AX^5 E^1 BOND ANGLE

<90

SQUAURE PLANAR AX^4 E^2 BOND ANGLE

90

VSEPR Theory (Valence Shell Electron Pair Repulsion)

-REPULSION BETWEEN ELECTRON DOMAINS DETERMINE THE MOLECULAR GEOMETRY

-ALL ELECTRON DOMAINS REPEL EACH OTHER

-THE PREFERRED GEOMETRY OF THE MOLECULE IS THE ONE IN WHICH THE ELECTRON DOMAINS HAVE MAXIMUM SEPARATION

ELECTRON GEOMETRY

ARRANGEMENT OF ELECTRON DOMAINS AROUND A CENTRAL ATOM (INCLUDES LONE PAIRS)

MOLECULAR GEOMETRY

ARRANGEMENT OF ATOMS AROUND THE CENTRAL ATOM (EXCLUDES LONE PAIRS)

LONE PAIR

HELD ONLY BY ONE NUCLEI AND TAKES UP MORE ROOM

BONDING ELECTRONS

HELD BETWEEN TWO NUCLEI AND TAKES UP LESS ROOM