Element toxicology

Polonium is a chemical element; it has symbol Po and atomic number 84. A rare and highly radioactive metal (although sometimes classified as a metalloid) with no stable isotopes, polonium is a chalcogen and chemically similar to selenium and tellurium, though its metallic character resembles that of its horizontal neighbours in the periodic table: thallium, lead, and bismuth. Due to the short half-life of all its isotopes, its natural occurrence is limited to tiny traces of the fleeting polonium-210 (with a half-life of 138 days) in uranium ores, as it is the penultimate daughter of natural ur

Gadolinium is a chemical element; it has symbol Gd and atomic number 64. It is a silvery-white metal when oxidation is removed. Gadolinium is a malleable and ductile rare-earth element. It reacts with atmospheric oxygen or moisture slowly to form a black oxide coating. Gadolinium below its Curie point of is ferromagnetic, with an attraction to a magnetic field higher than that of nickel. Above this temperature it is the most paramagnetic element. It is found in nature only in an oxidized form. When separated, it usually has impurities of the other rare earths because of their similar chemical

uranium with a lower content of the fissile isotope U-235 than natural uranium

condition resulting from the harmful effects of breathing molecular oxygen at increased partial pressures

arsenic affecting human life

informal measurement of ionizing radiation exposure; approximately 0.1 microsievert

Potassium-40 (K) is a long lived and the main naturally occurring radioactive isotope of potassium, with a half-life of 1.248 billion years. It makes up about 117 of natural potassium, making that mixture very weakly radioactive; the short life means this was significantly larger earlier in Earth's history.

Berylliosis, or chronic beryllium disease (CBD), is a chronic allergic-type lung response and chronic lung disease caused by exposure to beryllium and its compounds, a form of beryllium poisoning. It is distinct from acute beryllium poisoning, which became rare following occupational exposure limits established around 1950. Berylliosis is an occupational lung disease.

2006 fatal poisoning of a former FSB and KGB officer

toxic and harmful effects of certain metals and their compounds to living organisms

chromium in the +6 oxidation state

allergic contact dermatitis that has allergic trigger nickel atom

medical condition

condition in which there are elevated levels of the fluoride ion in the body

medical condition