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Chapter 11: Modern Atomic Theory
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21
Chemistry
11th Grade
06/03/2013

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Term
Electromagnetic Radiation
Definition
Radiant energy that exhibits wave-like behavior & travels through space at the speed of light in a vacuum.
Term
Wavelength
Definition
The distance between two consecutive peaks or troughs in a wave.
Term
Photon
Definition
A "particle" of electromagnetic radiation.
Term
Quantized Energy Levels
Definition
Certain discreet energy levels of an atom.
Term
Wave Mechanical Model
Definition
Electron states are described by orbitals.
Term
Orbital
Definition
A representation of the space occupied by an electron in an atom; the probability distribution for an electron.
Term
Principal Energy Levels
Definition
Discrete & limited energy levels of an atom.
Term
Sublevels
Definition
Divisions of principle energy levels containing the s, p, d, & f blocks.
Term
Pauli Exclusion Principle
Definition
An atomic orbital can hold a maximum of two electrons, & those two electrons must have opposite spins.
Term
Electron Configuration
Definition
Orbital level with the represented electrons.
Term
Orbital (Box) Diagram
Definition
Orbitals & their categories represented by boxes & arrows signaling opposite spin.
Term
Valence Electrons
Definition
The electrons in the outermost occupied principal quantum level of an atom.
Term
Core Electrons
Definition
Inner electrons in an atom; one that is not in the outermost (valence) principal quantum level.
Term
Lanthanide Series
Definition
A group of 14 elements following lanthanum on the periodic table, in which the 4f orbitals are being filled.
Term
Actinide Series
Definition
A group of 14 elements following actinium on the periodic table in which the 5f orbitals are filled.
Term
Main-Group Representative Elements
Definition
Elements in group 1-8 on the periodic table. The group number gives the sum of the valence s & p electrons.
Term
Metals
Definition
Elements that give up electrons relatively easily & are typically lustrous, malleable, & a good conductor of electricity.
Term
Nonmetals
Definition
An element that does not exhibit metallic characteristics. Chemically, a typical nonmetal accepts electrons from a metal.
Term
Metalloids
Definition
An element that has both metallic & nonmetallic properties.
Term
Atomic Size
Definition
As the principal energy level increases or decreases, so does the atomic size.
Term
Ionization Energy
Definition
The quantity of energy required to move an electron form a gaseous atom or ion.
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