Physics

Phosphorus Pentoxide Definition Phosphorus pentoxide is a white odourless solid produced when phosphorus burns: has a strong affinity for water with which it forms phosphoric…

Tricresyl Phosphate Definition Tricresyl phosphate (TCP) is a colorless, odorless liquid. Insoluble in water and slightly denser than water. Toxic by ingestion and skin absorption.…

Tellurium Definition Tellurium is a metalloid element that occurs as either a brittle, shiny, silvery-white crystal or a gray or brown powder. It is far…

Polonium Definition Polonium is a radioactive metallic element, occurring naturally in small quantities as a product of radium disintegration and produced synthetically by bombarding bismuth…

Bismuth Definition Bismuth is a brittle, pinkish-white, crystalline metallic element that occurs in nature as a free metal and in various ores. Bismuth is the…

Cadmium Definition Cadmium is a rare, soft, bluish-white metallic element that occurs mainly in zinc, copper, and lead ores. Its atomic number 48; atomic weight…

Atomic Clock Definition Atomic clock is an extremely precise clock whose rate is controlled by a periodic process, such as vibration, or the absorption or…

Caesium Definition Caesium is a soft, ductile, silvery-white element of the alkali group. It is liquid at room temperature and is the most reactive of…

Definition Barium is a soft, silvery-white metallic element of the alkaline-earth group. It occurs only in combination with other elements, especially in barite. It is…

Strontium Definition Strontium is a soft, silvery metallic element of the alkaline-earth group that occurs naturally only as a sulfate or carbonate. It is the…

Rubidium Definition Rubidium is a soft, silvery-white metallic element of the alkali group. It ignites spontaneously in air and reacts violently with water. It is…

About Lithium Definition Lithium is a soft, silvery metallic element of the alkali group that occurs in small amounts in some minerals. It is the…