The Periodic Table
The second series of inner transition elements which goes from thorium to lawrencium.
Elements in group 1 of the periodic table.
Alkaline Earth Metals
Elements in group 2 of the periodic table.
Substance that speeds up a chemical reaction but is not used up itself or permanently changed.
Family of elements in the periodic table that have similar physical or chemical properties.
Any element in group 17 of the periodic table.
The first series of inner transition elements which goes from cerium to lutetium.
Element that has luster, is malleable, ductile, and a good conductor of heat and electricity.
Element that shares some properties with both metals and nonmetals.
Elements in group 18 of the periodic table.
Element that is usually a gas or brittle solid at room temperature and is a poor conductor of heat and electricity.
Horizontal row of elements in the periodic table whose properties change gradually and predictably; third-longest division of geologic time; is subdivided into epochs and is characterized by the types of life that existed worldwide.
Elements in groups 1 and 2 and 13-18 in the periodic table that include metals, metalloids, and nonmetals.
Element that does not conduct electricity as well as well as a metal but conducts it better that a nonmetal.
All other actinides are synthetic elements. Synthetic metals are made in laboratories and nuclear reactors.
Elements in groups 3-12 in the periodic table, all of which are metals.