Physics

Ruthenium Definition Ruthenium (symbol Ru) is a rare, silvery-gray metallic element that is hard, brittle, and very resistant to corrosion. It is a rare transition…

Rhodium Definition Rhodium (Rh) is a rare, silvery-white metallic element that is hard, durable, and resistant to acids. It is a noble metal and a…

Palladium Definition Palladium (Pd) is a malleable, ductile, grayish-white metallic element that occurs naturally with platinum. Palladium, platinum, rhodium, ruthenium, iridium and osmium form a…

Technetium Definition Technetium is a silvery-gray, radioactive metallic element. It was the first element to be artificially made, and it is produced naturally in extremely…

Hafnium Definition Hafnium is a bright, silvery metallic element that occurs in zirconium ores, with symbol Hf. Because hafnium absorbs neutrons better than any other…

Scandium Definition Scandium is a soft, silvery, very lightweight metallic element that is found in various rare minerals and is a byproduct in the processing…

Promethium Definition Promethium is a radioactive metallic element of the lanthanide series, which is does not occur in nature but is prepared through the fission…

Thulium Definition Thulium is a soft, silver-gray metallic element of the lanthanide series with symbol Tm. Its Atomic number 69; atomic weight 168.934; melting point…

Samarium Definition Samarium is a silvery-white metallic element of the lanthanide series that exists in several forms and has seven naturally occurring isotopes. Its atomic…

Lutetium Definition Lutetium is a silvery-white metallic element of the lanthanide series that is used in nuclear technology. It is the last element in the…

Euxenite Definition Euxenite is a rare brownish-black mineral containing erbium, cerium, uranium, columbium, and yttrium. Titanium replaces niobium–tantalum in the molecular structure to form the…

Ytterbium Definition Ytterbium is a soft, silvery-white metallic element of the lanthanide series that occurs as seven stable isotopes with symbol Yb. Its atomic number…