Bequerel: discovered that uranium is radioactive Radioactivity = spontaneous emission of radiant E from an element as its nucleus decays. Radioactivity does not come from stable elements. 9. Marrie & Pierre Curie: Discovered 2 radioactive element Po(polonium) and Ra (Radioactive) 10. Ernest Rutherford: British scientist who discovered 3 kinds of radioactivity. Alpha: 2 plus charge & heaviest/ 3 is the slowest Beta: charge very light weight; fast Gamma: no charge (neutral) (no particles) Just lead
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uranium-238. Radon-220 is formed in the decay chain of thorium-232. It is radon-222 that most readily occurs in the environment. Atmospheric releases of radon-222 results in the formation of decay products that are radioisotopes of heavy metals (polonium‚ lead‚ bismuth) and rapidly attach to other airborne materials such as dust and other materials facilitating inhalation. The amount of radon in the soil depends on complex soil chemistry‚ that varies from one house to the next. Radon levels in the
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find out how the alpha particle would react against the thin foil. Geiger and Marsden constructed a lead box (to prevent radiation spreading all over the vacuum) with a hole on the center of the box‚ and inserted an alpha particle emitter (decaying polonium-214) inside the box. About five centimeters in front of the hole on the lead box was a gold foil with approximately 8.6x10-6 thick. The apparatus was then surrounded by zinc sulfide screen‚ which would
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(2011‚ December). Meet the Most Interesting Man in the World. Retrieved December 6‚ 2011‚ from http://www.wcax.com/story/16192523/meet-the-most-interesting-man-in-the-world Fröman‚ N. (1996‚ February 28). Marie and Pierre Curie and the Discovery of Polonium and Radium. Retrieved December 11‚ 2011‚ from Nobel Prize: http://www.nobelprize.org/nobel_prizes/physics/articles/curie/ IBM. (2011). Executive Officers. Retrieved December 10‚ 2011‚ from http://www.ibm.com/investor/governance/executive-officers
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Periodic Table Timeline http://www.history-timelines.org.uk/events-timelines/19-periodic-table... Periodic Table Timeline Timelines of Events History & Timelines Index Next Event Timeline>> Periodic Table Timeline This Chemistry Timeline has been developed to provide a ’snapshot’ of the famous people and events during this historical time period. Important dates in a fast‚ comprehensive‚ chronological‚ or date order providing an actual sequence of important past events which were
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The quote‚ “If you educate a boy‚ you educate an individual but if you educate a girl‚ you educate a nation” originated from an African proverb. It might have originated because of the societal roles of men and women‚ society’s expectations‚ and the contribution each gender has made to the community. Both men and women have educated the nation in many different ways‚ either by contributing to the society‚ or to their families. Hence‚ I disagree with this quote‚ as not all men have never educated
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The Ripple Effect of Smoking It has become common knowledge that smoking is bad for people’s health‚ nonetheless people continue to smoke. To be honest‚ that is fine. If people want to endanger themselves by smoking then I wish them a swift and peaceful end (though most smokers die a slow and agonizing death). What is not acceptable is the effect that smoke has on non-smokers who have almost no way of getting away from smoke unless they want to stay in their house. Smokers affect everyone
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Claro M. Recto Information and Communication Technology High School Doña Aurora St.‚ Claro M. Recto‚ Angeles City Telephone #(045) 887 5502 E-mail Add: cmricthsangelescity@yahoo.com Website: www.cmricthsangeles.tk Name: Year and Section: Topic: Objectives: 1. Trace the development of the Modern Periodic Table of Elements; 2. Describe the contributions of early scientists in the development of the Periodic Table of Elements; and 3. Analyze the basis of
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Pineda‚ Carlitos Miguel Ponce M. January 9‚ 2013 AIT2A Natural Science 12 ATOM DEVELOPMENT WITH SCIENTISTS INVOLVED 400 B.C. - Democritus’ atomic theory posited that all matter is made up small indestructible units he called atoms. Democritus expanded the idea to state that matter was composed of small particles called "atoms" that could be divided no further. These atoms were all composed of the same primary matter with the only differences between them being their size‚ shape
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Following the end of the Second World War‚ relations between the Soviet and the Western bloc deteriorated quickly. British prime minister Churchill said that the Soviet occupation of Eastern Europe was like ’an iron curtain’. Relations were generally tense during the ensuing Cold War‚ typified by spying and other covert activities. The British and American Venona project was established in 1942 for cryptanalysis of messages sent by Soviet intelligence. Soviet spies were later discovered in Britain
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