the second series of inner transition elements which goes from thorium to lawrencium

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

elements in group 17 of the period table

the first series of inner transition elements which goes from cerium to luteium

element that shares properties with both metals and nonmetals

elements in group 18 of the periodic table

horizontal row of elements in the periodic table whose properties change gradually and periodically

elements in groups 1 and 2 and 13-18 of the periodic table; includes metals, nonmetals and metalloids

element that has luster, is malleable, ductile, and a good conductor of heat and electricity

elements in groups 3-12 of the periodic table; metals

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