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16 terms

Chapter 5 Vocabulary

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periodic law
Physical and chemical properties of the elements are periodic functions of their atomic numbers.
cation
a positive ion
electronegativity
a measure of the ability of an atom in a chemical compound to attract electrons
lanthanides
14 elements with atomic numbers from 58 to 71
actinides
14 elements with atomic numbers from 90 to 103
anion
a negative ion
alkali metals
elements of Group 1 of the periodic table
main group elements
elements in the s and p blocks
halogens
elements of Group 17
periodic table
An arrangement of the elements in order of their atomic numbers so that elements with similar properties fall in the same column.
alkaline-earth metals
elements of Group 2 of the periodic table
valence electrons
electrons available to be lost, gained, or shared in the formation of chemical compounds
transition elements
elements that are metals with typical metallic properties in the d block of the periodic table
ion
an atom or group of bonded atoms that have a positive or negative charge
atomic radius
one half the distance between the nuclei of identical atoms tht are bonded together
ionization
any process that results in the formation of an ion