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ORGANIC CHEMISTRY
Chapter 1
30
Chemistry
Undergraduate 2
01/21/2009

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Term
Isotopes
Definition
Atoms with the same number of protons but different numbers of neutrons
Term
Orbitals
Definition
Where electrons that are bound to nuclei are found. An allow energy state for an electron, with an associated probability function that defines the distribution of electron density in space
Term
Electon Density
Definition
The probablility of finding the electron in a particular part of the orbital
Term
Node
Definition
A region of zeron electron density
Term
Degenerate orbitals
Definition
Orbitals with identical energies
Term
Heisenberg uncertainty principle
Definition
We can never determine exactly where the electron is
Term
Pauli exclusion principle
Definition
Each orbial can hold a maximum of 2 electrons, provided that their spins are paired.
Term
Aufbau principle
Definition
Build up the electronic configuration of an atom's ground (most stable) state
Term
Valence Electrons
Definition
The electrons in the outermost shell
Term
Hund's Rule
Definition
When there are two or more orbitals of the same energy, electrons will go into different orbitals rather than pair up in the same orbital
Term
Ionic Bond
Definition
Results when ions have opposite charges and they attract each other . Usually results in the formation of a large crystal lattice rather than individual molecules.
Term
Covalent Bonding
Definition
Electrons are shared rather than transfered
Term
Lewis Structure
Definition
Symbolizes the bonding in a covalent molecule, where each valence electron is symbolized by a dot or by a dash.
Term
Nonbonding Electrons
Definition
Valence-shell electrons that are not shared between two atoms, often called a lone pair
Term
Single Bond
Definition
The sharing of one pair of electrons between two atoms
Term
Double Bond
Definition
The sharing of two pairs of electrons between two atoms
Term
Triple Bond
Definition
The sharing of three pairs of electrons between two atoms
Term
Acetylene
Definition
What is the common name for Ethyne?
Term
4
Definition
Carbon ususally forms how many bonds?
Term
3
Definition
Nitrogen usually forms how many bonds?
Term
1
Definition
How many lone pairs does Nitrogen have in a stable state?
Term
2
Definition
How many lone pairs does oxygen have in a stable state?
Term
2
Definition
Oxygen usually forms how many bonds?
Term
1
Definition
How many bonds does a hydrogen form?
Term
0
Definition
How many lone pairs does hydrogen have in a stable state?
Term
3
Definition
How many lone pairs does a halogen have in its stable state?
Term
1
Definition
How many bonds does a Halogen usually form?
Term
Valence
Definition
What is another term for the number of bonds an atom usually forms?
Term
Polar Bond
Definition
When one of the bonding electrons are attracted more strongly to one of the two nuclei. An unequally shared pair of bonding electrons
Term
Formal Charges
Definition
A methond for keeping track of charges, showing what charge would be on an atom in a particular Lewis Structure
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