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Ionization energy
Amount of energy required to remove the outermost electrons from the atom
Increases right and up the periodic table
Electron shielding
Inner electrons shield the charge felt by the valence electrons
Increases down the periodic table
Atomic radius
Half of the distance between neighboring nuclei
Increases left and down the periodic table
Electronegativity
Ability of an atom to attract electrons
Noble gases do not have electronegativity values