Module 9: Polyatomic Ions and Molecular Geometry

polyatomic ions
Ions formed when a group of atoms gains or loses electrons (285)
tetrahedron
A molecular shape in which a central atom is surrounded by 4 bonds, each of which is 109 degrees apart from the others (291)
VSEPR
Valence Shell Electron Pair Repulsion (291)
VSEPR Theory
Molecules will attain whatever shape keeps the valence electrons of the central atom as far apart from one another as possible. (291)
pyramidal
Molecular shape in which a central atom is surrounded by 3 bonds which form a pyramid. The bonds are 107 degrees apart. (292)
bent
Molecular shape in which a central atom is bonded to two other atoms and the bonds are 105 degrees apart. (293)
trigonal
Molecular shape in which a central atom is surrounded y 3 bonds, each of which is 120 degrees apart from the others (292).
linear
Molecular shape in which a central atom with 2 bonds forms a straight line. Bond angle is 180 degrees. (295)
purely covalent bond
A covalent bond in which the electrons are shared equally between the atoms involved (298)
polar bond
Covalent bond in which the electrons are shared unequally between the atoms involved (299)
polar covalent molecule
Covalent molecule that has fractional charges on some or all of its atoms. (303)
Polar covalent compounds can dissolve:
Other polar covalent compounds
Ionic compounds

(This is because both types of compounds contain electrical charges.)
(307)

Purely covalent compounds can only dissolve:
other purely covalent compounds.

(This is because no electrical charges are present.)
(307)

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