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Vocab: U4

........

TermDefinition
Mendeleev Russian chemist who created the first valid periodic table of the elements in 1869.
Moseley English physicist. Used X-ray diffraction to show that each element has an atomic number. Arranged elements by increasing atomic number.
periodic law The principle that the properties of the elements recur periodically as their atomic numbers increase
family A vertical column in the periodic table of elements
group A vertical column in the periodic table of elements
period A sequence of elements arranged in order of increasing atomic number and forming one of the horizontal rows in the periodic table
electron distribution A function which gives the number of electrons pper unit volume of phase space
valence electron A function in an outer shell of an atom that can participate in forming chemical bonds with other atoms
noble gas distribution A short hanf of electron distribution. Constructed by putting the symbol of the noble gas in the period before the element in brackets and continuing the electron configuration from where the noble gas left off
energy level one of the allowed values of the internal energy of an isolated physical system
stable Not easily decomposed or otherwise modified chemically
metalloid an elements which exhibits the external characteristics of a metal but behaves chemically both as a metal and a nonmetal
semimetal another name for an element which exhibits the external characteristics of a metal but behaves chemically as a metal and a nonmetal
atomic radius half the distance between the nuclei of two like atoms that are covalently bonded
electron affinity The work needed in removing and electron fro a negative ion, thus restoring the neutrality of an atom or molecule
ionization energy the amount of energy needed to remove an electron from a given kind of atom or molecule to an infinite distance
electron configuration the orbital and spin arrangement of an atom's electrons, specifying the quantum numbers of the atom's electrons in a given state.
Created by: ii_UnkownWaterz
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