atomic radius - Increases right to left and top to bottom, ionic radius - decreases left to right through anions, increases in first cation, then decreases, ionization energy - energy needed to remove an electron from an atom, electron affinity - energy released when electron is "captured" by atom, electronegativity - ability of atom to attract an electron, Moseley - arranged periodic table by atomic number, Mendeleev - Stated Periodic Law and predicted discovery of more elements, Newlands - Noted periodic pattern in every eighth element, Lavoisier - made list of 23 elements, Meyer - noted connection between mass and properties, group, family - elements with same number of valence electrons, period - elements with same # of energy levels, metals - are lustrous, malleable, ductile, good heat and electricity conductors, nonmetals - usually dull, brittle, poor conductors, metalloids - semiconductors, lustrous, brittle, alkali metals - highly reactive, low melting points, 1 valence e-, Noble gases - very stable, nonreactive elements, halogens - salt-formers, highly electronegative, transition metals - malleable, ductile conductors with varying valence electrons, rare earth metals - soft and reactive, high electrical conductivity,

Trends of Periodic Table

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