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A set of assumptions proposed by the English scientist John Dalton to explain the chemical behavior of matter.
Atomic Theory #4
Chemical reactions change only the way that atoms are combined in compounds. The atoms themselves are unchanged.
Atomic Mass Unit (amu)
A convenient unit for describing the mass of an atom; 1 amu equals 1/12 the mass of a carbon-12 atom
Main Group Elements
An element in one of the two groups on the left or the six groups on the right of the periodic table.
Transition Metal Element
An element in one of the 10 smaller groups near the middle of the periodic table.
Inner Transition Metal Element
An element in one of the 14 groups shown separately at the bottom of the periodic table.
A grouping of electrons in a shell according to the shape of the region of space they occupy.
EC Rule #3
Two or more orbitals with the same energy-- the three "p" orbitals or the five "d" orbitals--- are each half filled before any one orbital is completely filled by addition of the second electron.
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