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25 Cards in this Set
- Front
- Back
electromagnetic radiation |
a form of energy that exhibits wavelike behavior as it travels through space |
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wavelength |
the shortest distance between equivalent points on a continuous wave |
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frequency |
the number of waves that pass a given point per second |
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amplitude |
the wave's height from the origin to a crest, or from the origin to a trough |
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electromagnetic spectrum |
includes all forms of electromagnetic radiation: the types of radiation differ in their frequencies and wavelengths |
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quantum |
the minimum amount of energy that can be gained or lost by an atom |
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Planck's constant |
6.626*10^-34 J*s where J is the symbol for the joule |
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photoelectric effect |
A phenomenon in which photo electrons are emitted from a metal's surface when light of a certain frequency shines on the surface |
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photon |
a mass less particle that carries a quantum of energy |
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atomic emission spectrum |
a set of frequencies of electromagnetic waves given off by atoms of an element; consists of a series of fine lines of individual colors |
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ground state |
the lowest allowable energy state of an atom |
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quantum number |
the number assigned to each orbit of an electron |
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de Broglie equation |
predicts that all moving particles have wave characteristics and relates each particle's wavelength to its frequency, its mass, and Planck's constant |
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Heisenberg uncertainty principle |
states that it is not possible to know precisely both the velocity and the position of a particle at the same time |
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quantum mechanical model of the atom |
an atomic model in which electrons are treated as waves; also called the wave mechanical model |
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atomic orbital |
a three-dimensional region around the nucleus of an atom that describes an electron's probable location |
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principal quantum number |
assigned by the quantum mechanical model to indicate the relative sizes and energies of atomic orbitals |
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principal energy levels |
the major energy levels of an atom |
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energy sublevels |
the energy levels contained within a principal energy level |
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electron configuration |
the arrangement of electrons in an atom which is prescribed by three rules-the aufbau principle, the Pauli exclusion principle, and Hund's rule |
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aufbau principle |
states that each electron occupies the lowest energy orbital available |
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Pauli's exclusion princliple |
states that a maximum of two electrons can occupy a single atomic orbital but only if the electrons have opposite spins |
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Hund's rule |
states that single electrons with the same spin must occupy each equal energy orbital before additional electrons with opposite spins can occupy the same orbitals |
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valence electrons |
electrons in the atom's outermost orbitals |
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electron-dot structure |
consists of an element's symbol, representing the atomic nucleus and inner-level electrons, that is surrounded by dots representing the atom's valence electrons |