Fifteen metallic elements with atomic numbers 89 through 103, all being radioactive.
Highly reactive metals in group 1 that readily lose one electron to form cations.
Shiny, silvery-white, somewhat reactive metals in group 2.
Group 17 elements that form strongly acidic compounds with hydrogen and salts with metals.
Fifteen metallic elements with atomic numbers 57 through 71, characterized by filling the 4f subshell.
General classification for elements that are good conductors of heat and electricity.
Elements with properties intermediate between those of metals and solid nonmetals.
Chemically inert, monoatomic gases at standard conditions with full valence shells.
Elements lacking metallic properties, typically highly electronegative.
Elements whose atoms have a partially filled d sub-shell, characterized by multiple oxidation states.
Classifies elements into groups with similar physical and chemical characteristics.