The Last Emperor essays

The Last Emperor essays The Last Emperor was a movie about Pu Yi, and how Pu Yi, who at the age of 3 comes to the Imperial Dragon Throne to become the Last Emperor of China. His whole life is spanned in this film, from his childhood, to his ultimate fate as an unskilled gardener in the streets of Beijing. The movie was directed by Bernardo Bertolucci. Bernardo Bertolucci was born on March 16, 1940 in Parma, Italy. He was born into a family of intelligent people. His father was a poet, anthologist, film critic and art history professor. Bertoluccis father even encouraged Bernardo when he was a child; he often brought Bernard to film screenings. When Bertolucci was fifteen he made two short films about children, and was also gaining popularity throughout Italy as a writer. His first book, In Search of Mystery, won the one of the top literary awards in Italy, the Premio Viareggio. At the University of Rome (1958-1961) Bertolucci began his film career as an assistant director to Pier Paolo Pasolini. But Bertol ucci left the University of Rome without graduating and started on an independent study of film. Bernardo Bertolucci's first feature film, The Grim Reaper was filmed on location in Rome in 1962. Before the Revolution, his second feature film, didnt do much better commercially than The Grim Reaper, but won him recognition at the Cannes Film Festival in 1964. For the next five years Bertolucci was not able to raise money for another feature length film, but instead directed a number of documentaries and helped director Julian Beck with some of his productions. His next film, The Spider's Strategem, was said to be an improvement over his first two feature films, but it was not until the release of The Conformist in 1970 that Bertolucci's directorial excellence became known. The film deals with Fascist Italy under Mussolini. Two years later Bertolucci directed The Last Tango in Paris, an erotic film starring Marlon ...

Isotopes Definition and Examples in Chemistry

Isotopes Definition and Examples in Chemistry Isotopes [ahy-suh-tohps]  are atoms with the same number of protons, but differing numbers of neutrons. In other words, the have different atomic weights. Isotopes are different forms of a single element. Key Takeaways: Isotopes Isotopes are samples of an element with different numbers of neutrons in their atoms.The number of protons for different isotopes of an element does not change.Not all isotopes are radioactive. Stable isotopes either never decay or else decay very slowly. Radioactive isotopes undergo decay.When an isotope decays, the starting material is the parent isotope. The resulting material is the daughter isotope. There are 275 isotopes of the 81 stable elements. There are over 800 radioactive isotopes, some of which are natural and some synthetic. Every element on the periodic table has multiple isotope forms. The chemical properties of isotopes of a single element tend to be nearly identical. The exception would be the isotopes of hydrogen  since the number of neutrons has such a significant effect on the size of the hydrogen nucleus. The physical properties of isotopes are different from each other since these properties often depend on mass. This difference may be used to separate isotopes of an element from each other by using fractional distillation and diffusion. With the exception of hydrogen, the most abundant isotopes of the natural elements have the same number of protons and neutrons. The most abundant form of hydrogen is protium, which has one proton and no neutrons. Isotope Notation There are a couple of common ways to indicate isotopes: List the mass number of an element after its name or element symbol. For example, an isotope with 6 protons and 6 neutrons is carbon-12 or C-12. An isotope with 6 protons and 7 neutrons is carbon-13 or C-16. Note the mass number of two isotopes may be the same, even though they are different elements. For example, you could have carbon-14 and nitrogen-14.The mass number may be given in the upper left side of an element symbol. (Technically the mass number and atomic number should be stacked in line with each other, but they dont always line up on a computer.) For example, the isotopes of hydrogen may be written:11H,  21H,  31H Isotope Examples Carbon 12 and Carbon 14 are both isotopes of carbon, one with 6 neutrons and one with 8 neutrons (both with 6 protons). Carbon-12 is a stable isotope, while carbon-14 is a radioactive isotope (radioisotope). Uranium-235 and uranium-238 occur naturally in the Earths crust. Both have long half-lives. Uranium-234 forms as a decay product. Related Words Isotope (noun), Isotopic (adjective), Isotopically (adverb), Isotopy (noun) Isotope Word Origin and History The term isotope was introduced by the British chemist Frederick Soddy in 1913, as recommended by Margaret Todd. The word means having the same place from the Greek words isos equal (iso-) topos place. Isotopes occupy the same place on the periodic table even though isotopes of an element have different atomic weights. Parent and Daughter Isotopes When radioisotopes undergo radioactive decay, the initial isotope may be different from the resulting isotope. The initial isotope is called the parent isotope, while the atoms produced by the reaction are called daughter isotopes. More than one type of daughter isotope may result. As an example, when  U-238 decays into Th-234, the uranium atom is the parent isotopes, while the thorium atom is the daughter isotope. A Note About Stable Radioactive Isotopes Most stable isotopes dont undergo radioactive decay, but a few do. If an isotope undergoes radioactive decay very, very slowly, it may be termed stable. An example is bismuth-209. Bismuth-209 is a stable radioactive isotope that undergoes alpha-decay, but has a half-life of 1.9 x 1019 years (which is more than a billion times longer than the estimated age of the universe). Tellurium-128 undergoes beta-decay with a half-life estimated to be 7.7 x 1024 years! Historical References Alexander Thomas Cameron,  Radiochemistry  (London, England: J. M. Dent Sons, 1910), p. 141. Soddy, Frederick. Intra-atomic charge. Nature 92, Springer Nature Publishing AG, 1913.. Strà ¶mholm, Daniel and Svedberg, Theodor (1909) Untersuchungen à ¼ber die Chemie der radioactiven Grundstoffe II. (Investigations into the chemistry of the radioactive elements, part 2),  Zeitschrift fà ¼r anorganischen Chemie,  63: 197–206. Thomson, J. J. (1912). XIX. Further experiments on positive rays.  Philosophical Magazine. Series 6.  24  (140): 209.