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18 Cards in this Set

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actinide
one of the 14 elements with atomic numbers from 90 (thorium, Th)
through 103 (lawrencium, Lr)
lanthanide
one of the 14 elements with atomic numbers from 58 (cerium, Ce)
to 71 (lutetium, Lu)
periodic law
the physical and chemical properties of the elements are periodic
functions of their atomic numbers
periodic table
an arrangement of the elements in order of their atomic numbers
so that elements with similar properties fall in the same column, or group
alkali metals
one of the elements of Group 1 of the periodic table (lithium,
sodium, potassium, rubidium, cesium, and francium)
halogen
one of the elements of Group 17 (fluorine, chlorine, bromine, iodine,
and astatine)
main-group element
an element in the s-block or p-block
transition element
one of the d-block elements that is a metal, with typical
metallic properties
alkaline-earth metal
one of the elements of Group 2 of the periodic table
(beryllium, magnesium, calcium, strontium, barium, and radium)
anion
a negative ion
electron affinity
the energy change that occurs when an electron is acquired by
a neutral atom
ion
an atom or group of bonded atoms that has a positive or negative
charge
ionization energy
the energy required to remove one electron from a neutral
atom of an element
atomic radius
one-half the distance between the nuclei of identical atoms that
are bonded together
electronegativity
a measure of the ability of an atom in a chemical compound
to attract electrons
ionization
the formation of ions from solute molecules by the action of the
solvent;
also any process that results in the formation of an ion
valence electrons
an electron that is available to be lost, gained, or shared in the
formation of chemical compounds
cation
a positive ion