Effective atomic number has two different meanings: one that is the effective nuclear charge of an atom, and one that calculates the average atomic number for a compound or mixture of materials. Both are abbreviated Zeff. ==For an atom== The effective atomic number Zeff, (sometimes referred to as the effective nuclear charge) of an atom is the num...
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http://en.wikipedia.org/wiki/Effective_atomic_number
number that represents the total number of electrons surrounding the nucleus of a metal atom in a metal complex. It is composed of the metal atom`s ... [1 related articles]
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http://www.britannica.com/eb/a-z/e/12
weighted average of the proton numbers of the constituents of a material NOTE - The weighting may be performed differently depending upon the interaction of interest, for example photoelectric effect or production of bremsstrahlung.
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http://www.electropedia.org/iev/iev.nsf/display?openform&ievref=393-14-04
the atomic number of a hypothetical element with which radiation of a specified kind would interact in the same way as it interacts with a compound or mixture of interest
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