Plutonium Essay I would like to work on the metal plutonium because the discovery of plutonium has a great impact on the world. Plutonium’s symbol is Pu and its atomic number is 94. This element has 150 neutrons and 94 protons and its standard atomic weigh is 244. Plutonium is located in the 7th period and it is a silvery white metal. One of its main uses is to act as the fuel of nuclear fission Plutonium does not exist naturally‚ although some say that small
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and radioactive isotopes of Sulfur and Phosphorous (35S and 32P). 2 Batches were created where one was of the sulfur and the other was of the phosphorous. In batch 1‚ the bacteriophage was cultured in the presence of the Sulfur isotpe‚ this resulted in a radioactive protein coat of the bacteriophage. In batch 2‚ the bacteriophage was cultured in the presence of the phosphorous isotope‚ this then resulted in the DNA of the bacteriophage being radioactive. They then took these new radioactive bacteriophages
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Etymology The name atom comes from the Greek ἄτομος (atomos‚ "indivisible") from ἀ- (a-‚ "not") and τέμνω (temnō‚ "I cut")‚[3] which means uncuttable‚ or indivisible‚ something that cannot be divided further.[4] The concept of an atom as an indivisible component of matter was first proposed by early Indian and Greek philosophers. In the 18th and 19th centuries‚ chemists provided a physical basis for this idea by showing that certain substances could not be further broken down by chemical methods
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baryta or BaO. But it was discovered in 1779 by Carl Scheele. Barium is classified as an alkaline-earth metal. Its atomic number is 56 and it is the fifth element in group 2.Natural Barium is made up of a mixture of seven stable isotopes‚ there are thirteen radioactive isotopes known to exist. Barium has never been found in nature in its pure form. When Scheele discovered barium in the 1700’s he could not isolate it he could only isolate the barium oxide. Another person to isolate the barium oxide was
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Hershey and Chase designed an experiment in which they could label protein or DNA and then track which entered the E. coli cell during infection. They grew one batch of T2 phage in the presence of radioactive sulfur‚ marking the proteins but not DNA. They grew another batch in the presence of radioactive phosphorus‚ marking the DNA but not proteins. They allowed each batch to infect separate E. coli cultures. Shortly after the onset of infection‚ they spun the cultured infected cells in a blender
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Chp. 4 Biology Study Guide Page 1 8/30/2011 BIOLOGY STUDY GUIDE CHAPTER 4– THE CHEMICAL BASIS OF LIFE Matter = anything that takes up space and has mass (major types of matter = solid‚ liquid‚ and gas) Any type of matter is made of one or more elements. o Element = a substance that cannot be broken down into other substances by regular chemical processes. (examples: gold‚ silver‚ mercury‚ etc.) There are approximately 25 elements necessary for life. • Examples: oxygen‚ carbon‚ hydrogen‚
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of the most famous scientists that ever lived. Her contributions such as the discovery of Radium and other key elements help us out every day‚ especially when getting an X-ray. Marie Curie is known to the world as the scientist who discovered radioactive metals i.e.‚ Radium and Polonium. Born and Death: Marie Curie was born November 7‚ 1867 in Poland and died on July 4‚ 1934. Her full name is Marie Sklodowska Curie. Personal life: As a child‚ Marie Curie amazed people with her great memory
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principle fuel for nuclear reactors‚ but it also is utilized in the production of nuclear weapons. Because uranium is radioactive‚ it is constantly emitting particles and changing into other elements‚ like thorium. Uranium has a well-established radioactive decay chain. U-238 and U-235 (which has 143 neutrons) are the most common isotopes of uranium. Uranium naturally includes all three isotopes (U-238‚ U-235‚ and U-234) [3]. Once Uranium enters your body in any way‚ it is widely distributed. Bone acts as
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Polonium has more isotopes than any other element‚ all of which are radioactive. Polonium dissolves readily in dilute acids‚ but is only slightly soluble in alkalis. Weight for weight it is about 2.5 x 1011 times as toxic as hydro cyanic acid (HCN). Polonium has been found in tobacco as a contaminant and in uranium ores. Polonium is radioactive and present only in extremely low abundances in the environment. It is quite metallic in nature despite its location beneath oxygen in the periodic table
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I. Tracers • Tracers are used to obtain images of a patients inner body- images of places that would otherwise be inaccessible • The tracer is a very small amount of a radioactive isotope with a short half-life; These two factors are necessary in the selection of a good tracer because they ensure that the radioactive material does not stay in the body for too long; some common tracers are listed below: Iodine 1 ( half-life of 31 8.1 days‚ used for diagnoses of thyroid problems) Iron
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