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Arsenic was discovered by Albertus Magnus (DE) in 1250
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Miners were dying relatively young as a result of exposure to radon. The Swiss physician Paracelsus identified their cause of death as a "wasting disease," and German scientist Georg Agricola suggested that mines be ventilated to protect miners.
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In the 1700s CO was discovered. The discoverer of CO is controversial.
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Cobalt is officially discovered
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Several chemists carried out experiments on fluorspar in the early 1800s including Gay Lussac, Louis Jacques Thenard, Humphry Davy, Carl Wilhelm Scheele and Joseph Priestley.
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Potassium metal was the first metal to be isolated by electrolysis.
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Humphrey Davy announced the discovery of the new element fluorine.
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Contenets of nickel discovered in white copper
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Potassium is discovered to be absent in most soil, increasing sales of potassium salts.
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In 1860, nonradioactive cesium was discovered by Gustav Kirchhoff and Robert Bunsen.
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Ferdinand Frederick Henri Moissan, a French chemist, finally isolated the element in 1866.
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British chemist George Gore passed an electric current through liquid HF but found that the gas which was liberated reacted violently with his apparatus
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A study of miners in the Ore Mountains shows that the lung disease killing miners is cancer, and in some mines it kills 75% of the miners. The "gas" is later though to have been radon emanation.
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Argon was discovered in 1894 by Sir William Ramsay. Its main use is lighting and it is obtained from air.
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No one knows the exact date of witch radon was discovered. But it was between the years 1898 to 1900 by Friedrich Ernest Dorn.
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Child lead poisoning linked to lead-based paints kills many children
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The first isolation of Radon was by William Ramsay and Robert Whytlaw-Gray in 1910. The picture is the apparatus they used to isolate it.
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The American Cancer Society has helped discovered and cure many cancers of the elements of the periodic table.
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Originally named niton after the Latin word for nitens, It was named radon in 1923.
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Uranium was fIrst discovered in Canada in 1930.
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In addition to the American Cancer Society, The Canadian Cancer Society has helped discover and cure many cancers envolved with elements of the periodic table,
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In the late 1930s, radioactive cesium-137 was discovered by Glenn T. Seaborg and Margaret Melhase.
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Otto Hahn, Lise Meitner, and Frits Strassmann discovered that the Uranium atom when bombarded by neutrons, actually split
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In World War 2, at first there was no use for fluorine. But it soon gained recognitation in atomic bombs.
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Until the 1940s, inorganic arsenic was used as therapeutic agents in the treatment of various diseases, such as leukemia, psoriasis and chronic bronchial asthma
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Plutonium was discovered in December 1940 by Glenn T. Seaborg , J. W. Kennedy, E. M. McMillan, A. C. Wah
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Glenn Seaborg and a team at the University of California fused uranium-238 with hydrogen atoms and plutonium was born.
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In 1942 - 1943, the United Kingdom government created tests of oxygen toxicity in divers.
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In 1943 private mining for uranium was ban so it could be used in atomic weapons for world war 2.
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Americans have gathered enough plutonium in order to make 3 atomic bombs. One was the bomb that hit Nagasaki, Japan
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In1947 private mining of uranium was unbanned.
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The symbol of Argon changes from A to Ar.
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The accident resulted in the contamination of Building 771 and the release of plutonium into the atmosphere, and caused US $818,600 in damage.
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One of the first nuclear disasters occurred in the Windscale nuclear reactor. This large disaster caused a lot of long term damage to the environment.
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a mistake in the Los Alamos plutonium prossesing plant caused Cecil Kelley to die from radiation.
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Transit 4A is launched with a plutonium battery.
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The sale of uranium in Canada was limited for peaceful purposes only.
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There was a Williams-Steiger Occupational Safety and Health Act made in 1970
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Human activities have been found to cause climate change. Carbon Monoxide is emitted mostly because of human activities and it causes climate change.
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Cobalt is first used as a pigment in China
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Scientist discover that the main source of indoor radon is air in the ground, drawn into buildings by underpressure indoors.
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The largest nuclear disaster in Chernobyl killed many people and caused huge long term damage
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Cesium chloride was removed from an abandoned hospital by people who didn't know what it was and distributed to others.
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With the cold war ending the US goverment put taxes on nuclear weapon making so two plutonium plants are dismanteled. This seems like an end to plutonium nuclear weapons.
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Employee pulls 5 gallon container of formaldehyde and methanol solution. It spilt on him from head to toe. He was burned badly and was hospitalized.
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The emissions start to significantly lower because of improvements in motor vehicle emissions.
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Argon Plasma Coagulation Invention LinkThis device uses Argon gas to treat gastric cancer.
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Thousands and tons of lead has been removed from the air, and blood levels of lead in our children are down 70 percent
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Cesium-137 is accidentally burned, causing a radioactive cloud that was detected in France, Italy, Switzerland, Germany and Austria.
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Argon Fluorohydride was discovered in 2000 by researchers at the University of Helsinki. It is a compound of argon with fluorine and hydrogen.
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In 2003 the use of this compound was banned by the US Environmental Protection Agency
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Ruptue/burst of dangerous chemicals on a railway in the states, formaldehyde was involved. It was a natural event.
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WHO/ Europe include lead on the list of Hazardous Chemicals: main risk for children's health as the most important neurotoxin for children
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Burns and explosion were caused by formaldehyde on a man working as a "Prepreg- Lead".
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The American government was in such a huge debt (1.4 BILLION dollars!) that they passed a "Privatize the sale of helium in the United States" act.
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Argon is discovered on Titan, the largest moon of saturn.
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Due to the high demand for helium in the medical world for the cooling of huge magnets which are what essentially powers MRI machines, paired with the ridiculously huge helium overusage in North America and a growing demand for the substance in Europe, helium supplies are running out.
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A buildup of argon gas inside a cargo ship killed three dockworkers. The three men suffocated in an area where the gas had pushed the oxygen out of the air. For more information, click here
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in punjab there was uranium poisoning to the towns people.
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Cesium- 137 encased in lead was lost when workers demolished an old factory.
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One of the most recent nuclear disasters occurred in Fukushima, Japan. A tsunami caused this nuclear disaster. No deaths or radiation sicknesses were caused by this disaster.
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The levels of Carbon Monoxide in the USA have decreased by 83% since the 1980s.
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Formaldehyde is spilt into North Bay's drinking water through a car crash involving a truck that was carrying formaldehyde.
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Plutonium leak in Washington poses 'long-term threat'
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Five people sufficated to death at a steel plant after argon gas leaked from a furnace. For more information, click here
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Lead paint is still currently being sld in many developing countries, making more and more children ill.
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Formaldehyde is spilt in car crash causing the content to spill all over the road. Chemical spill caused eye irritation and breathing difficulty to those who were involved.
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Scientists were able to convert carbon dioxide into carbon monoxide which can be turned into helpful chemicals. The chemicals can then be turned into synthetic fumes which can decrease greenhouse gas emissions.
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Unless another source of helium can be found, there will be almost no helium available by 2018, perhaps 2020 if we're lucky.
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The levels of CO in the atmosphere are projected to decrease even more.
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by this time if the problem is not handeled. by this time we could have a shortage on plutonium-238 and it could run out. this could slow space exploration a lot
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10 people die after uranium poisoned their drinking water.
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Lead is not exposed to humans without safety equipement on, and new medicines are invented to help cure humans diagnosed with lead poisoning or help prevent humans from getting diagonsed with it.
