electronegativity		The physical and chemical properties of the elements are periodic functions of thier atomic numbers.
ionization energy		The electrons available to be lost, gained, or shared, in the fromation of chemical compounds.
alkaline-earth metals		Are the 14 elements with atomic numbers from 58-71.
anion		A negative ion.
ionization		An element in the s-block or the p-block.
periodic table		The elements of Group 1 of the periodic table.
cation		A positive ion.
valence electron		One of the elements of Group 17.
atomic radius		An arrangement of the elements in order of thier atomic numbers so that elements with similar properties fall in the same column, or group.
main-group element		Any process that results in the formation of an ion.
halogen		Are the 14 elements with atomic numbes from 90-103.
periodic law		Is an atom or group of bonded atoms that has a positive or negative charge.
electron affinity		The energy changed that occurs when an electron is acquired by a neutral arom.
transition element		The elements of Group 2 of the periodic table.
actinide		Is a measure of the ability of an atom in a chemical compound to attract electrons.
lanthanide		The d-block elements are metals with typical metallic properties.
ion		May be defined as one-half the distance between the nuclei of identical atoms that are bonded together.
alkali metal		The energy required to remove one electron from a neutral atom of an element.