Elements that can exist in multiple crystalline forms.
Known and used by ancient civilizations before the modern era.
Metals that are used to make coins.
Elements that exist as diatomic molecules.
Metals with high density, atomic weight, or atomic number, often toxic to life forms.
Metals with low density and atomic weight.
Elements occurring in nature as a single stable isotope.
Metals that occur in their native elemental form in nature.
Elements that are resistant to corrosion and oxidation in moist air.
Six transition metal elements (Ru, Rh, Pd, Os, Ir, Pt) known for their catalytic activity and corrosion resistance.
Precious metals are rare, naturally occurring metallic chemical elements that have high economic value.
The lanthanide elements plus scandium and yttrium, known for their magnetic and optical properties.
Metals with extremely high melting points and resistance to thermal deformation.
Metals with high atomic number and mass, often radioactive.
Qualitative properties and descriptors associated with chemical elements.