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At small ionic separations, however, the closed electron shells of the adjacent
ions begin to overlap in space, resulting in a ... (The basic cause of this repulsion
is accounted for by the Pauli exclusion principle, which states that no two
Because of the pseudopotential influence, an electron begins to diffract before it
quite reaches the Bragg reflection plane; the ... In addition to the conduction
electrons there Atomic are electrons, called d electrons as in the atom, which
have d ...
In an atom, for example, the electrons have certain allowed (discrete) energies
and are said to be bound. In a collision a bound electron may be raised from a
low to a high energy state, or excited. This, however, can occur only by the ...
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This is the 198215th Edition, in two halves, with the Macropaedia and the Micropaedia. First published in 1768, the publisher is the oldest English-language encyclopedia still in print. Two Scottish ... Read full review
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For virtually all its 238 years,Britannica has ruled the shelves as a peerless general encyclopedia. Reviewers have consistently given it high marks for most of the 12 criteria identified inKister's ... Read full review