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Chapter 6 - Chemical Bonding
Vocabulary/Key Terms
40
Chemistry
Not Applicable
03/16/2004

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Term
chemical bond
Definition
a mutual electrical attraction between the nuclei and valence electrons of different atoms that binds the atoms together
Term
ionic bonding
Definition
the chemical bond resulting from electrical attraction between large numbers of cations and anions
Term
covalent bonding
Definition
a chemical bond resulting from the sharing of an electron pair between two atoms
Term
nonpolar-covalent bond
Definition
a covalent bond in which the bonding electrons are shared equally by the bonded atoms, resulting in a balance of electrical charge
Term
polar
Definition
having an uneven distribution of charge
Term
polar-covalent bond
Definition
a covalent bond in which the bonded atoms have an unequal attraction for the shared electrons
Term
molecule
Definition
a neutral group of atoms that are held together by covalent bonds
Term
molecular compound
Definition
a chemical compound whose simplest units are molecules
Term
chemical formula
Definition
a formula that indicates the relative numbers of atoms of each kind in a chemical compund by using atomic symbols and numerical subscripts
Term
molecular formula
Definition
a formula showing the types and numbers of atoms combined in a single molecule of a molecular compound
Term
diatomic molecule
Definition
a molecule containing only two atoms
Term
bond length
Definition
the distance between two bonded atoms at their minimum potential energy, that is, the average distance between two bonded atoms
Term
bond energy
Definition
the energy required to break a chemical bond and form neutral isolated atoms
Term
octet rule
Definition
chemical compounds tend to form so that each atom, by gaining, losing, or sharing electrons, has an octet of electrons in its highest occupied energy level
Term
electron-dot notation
Definition
an electron-configuration notation in which only the valence electrons of an atom of a particular element are shown, indicated by dots placed around the element's symbol
Term
unshared pair
Definition
a pair of electrons that is not involved in bonding and that belongs exclusively to one atom
Term
lone pair
Definition
a pair of electrons that is not involved in bonding and that belongs exclusively to one atom
Term
Lewis structure
Definition
a formula in which atomic symbols represent nuclei and inner-shell electrons, dot-pairs or dashes between two atomic symbols represent electron pairs in covalent bonds, and dots adjacent to only one atomic symbol represent unshared electrons
Term
structural formula
Definition
a formula that indicates the kind, number, arrangement, and bonds but not the unshared electron pairs of the atoms in a molecule
Term
single bond
Definition
a covalent bond produced by the sharing of one pair of electrons between two atoms
Term
double bond
Definition
a covalent bond produced by the sharing of two pairs of electrons between two atoms
Term
triple bond
Definition
a covalent bond produced by the sharing of three pairs of electrons between two atoms
Term
multiple bond
Definition
a double or triple bond
Term
resonance
Definition
the bonding in molecules or ions that cannot be correctly represented by a single Lewis structure
Term
ionic compound
Definition
a compound composed of positive and negative ions that are combined so that the numbers of positive and negative charges are equal
Term
formula unit
Definition
the simplest collection of atoms from which an ionic compound's formula can be established
Term
lattice energy
Definition
the energy released when one mole of an ionic crystalline compound is formed from gaseous ions
Term
polyatomic ion
Definition
a charged group of covalently bonded atoms
Term
metallic bonding
Definition
chemical bonding that results from the attraction between metal atoms and the surrounding sea of electrons
Term
malleability
Definition
the ability of a substance to be hammered or beaten into thin sheets
Term
ductility
Definition
the ability of a substance to be drawn, pulled, or extruded through a small opening to produce a wire
Term
molecular polarity
Definition
the uneven distribution of molecular charge
Term
VSEPR theory
Definition
repulsion between the sets of valence-level electrons surrounding an atom causes these sets to oriented as far apart as possible
Term
hybridization
Definition
the mixing of two or more atomic oribitals of similar energies on the same atom to produce new orbitals of equal energies
Term
hybrid orbitals
Definition
orbitals of equal energy produced by the combination of two or more orbitals on the same atom
Term
intermolecular forces
Definition
the force of attraction between molecules
Term
dipole
Definition
equal but opposite charges that are separated by a short distance
Term
dipole-dipole force
Definition
a force of attraction between polar molecules
Term
hydrogen bonding
Definition
the intermolecular force in which a hydrogen atom that is bonded to a highly electronegative atom is attracted to an unshared pair of electrons of an electronegative atom in a nearby molecule
Term
London dispersion force
Definition
an intermolecular attraction resulting from the constant motion of electrons and the creation of instantaneous dipoles
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