Transition Elements Essays (419 words) - Periodic Table,

Transition Elements Transition Elements, series of chemical elements that share similar electron orbital structures and hence similar chemical properties. The transition elements are commonly defined as the 30 elements with atomic numbers 21 to 30, 39 to 48, and 71 to 80. The transition elements exhibit multiple valences or oxidation states typically ranging from +1 to +8 in compounds. In organometallic compounds, consisting of metals bonded to organic species, transition metals sometimes take on negative oxidation states. The transition elements have such typical metallic properties as malleability, ductility, high conductivity of heat and electricity, and metallic luster. They tend to act as reducing agents (donors of electrons), but are less active in this regard than the alkali metals and alkaline earth metals, which have valences of +1 and +2, respectively. There are exceptions, as in the case of mercury (Hg), which is a liquid Transition elements in general have high densities and melting points and exhibit magnetic properties. They form both ionic and covalent bonds with anions (negatively charged ions), and such compounds are in general brightly colored.. They have high electrical conductivity because of delocalization of the s electrons simil ar to what occurs in the alkali and alkaline-earth metals. Another characteristic of the transition metals is the great variety of oxidation states shown in its compounds. Several transition elements and their compounds are important catalysts (see Catalysis) in a variety of industrial processes, especially in the manufacture of petroleum and plastic products, where organic molecules are hydrogenated, oxidized, or polymerized (see Chemical Reaction; Hydrogenation; Polymer). Compounds of titanium, aluminum, or chromium are used in the polymerization of ethylene to form polyethylene. Catalysts containing iron are used in preparing ammonia from hydrogen and nitrogen. Molecules containing transition elements are important to the biochemical processes in many living systems, the most familiar example of which is the iron-containing heme complex of hemoglobin, which is responsible for oxygen transport in the blood of all vertebrates and some invertebrates. Most transition metals are colored and make some of their ionic compounds colored. This is because they absorb some of the frequencies of white light. This is attributed to electronic transitions in the d subshell, separating them into different levels of energy. When light is absorbed, an electron is raised from a lower state to a higher state, giving the rise to color. The stored energy is then dissipated through heat. The transition metals also have complex ionic structures because of the availability of d orbitals for participating in chemical bonding. Science

Wallstreet movie critisim essays

Wallstreet movie critisim essays It is difficult to discern whether the movie Wall Street is intended to be a scathing critique of modern bureaucracies in general or the men and women who work within them. Oliver Stone uses the traditional American coming of age story to attack modern perceptions of success and power in the corporation. Bud Fox (Charlie Sheen) is a small town guy whose father worked his whole life at a blue collar job to provide him with all the opportunities his limited income could provide. Empowered by his fathers drive and an NYU degree in finance Bud sets his sights on striking it rich on the New York stock exchange. But Buds unbridled ambition combined with his resistance to advice of those around him eventually lead him into the shady world of big business fraud and insider trading. It is within this context that Oliver Stone uses Michael Douglas character Gordon Gecko to show what it takes to be successful in business as an individual and a corporation. Gordon Gecko (Michael Douglas) is smart, driven, powerful, incredibly wealthy and everything the Bud aspires to be. He proudly espouses, in true merchant fashion, fact that he produces nothing whatsoever but only uses money to produce the illusion of power. At one point while arguing the merits of his plans to liquidate the company Buds father has worked for twenty-four years Gordon argues that 90 percent of the public has little or no net worth and that the richest 1 percent own half of the countries wealth, and so if Bud wants to be successful he is going to have to decided who he is with. Is he with the 99 percent of hard working laborers who are being robed of the production of their efforts or the 1 percent that lives the life of luxury those efforts provide. As time progresses Geckos unyielding drive for more comes to symbolize not only his own unscrupulous methods for personal advancement but for all major corporat...

Nursing research Essay Example | Topics and Well Written Essays - 500 words - 4

Nursing research - Essay Example so improved the organization as a whole since its HCAHPS scores have improved due to the solutions that I have developed, planned, and implemented to success. Significantly, the lessons learnt has impacted my level of knowledge and skills that have equipped my practice with crucial tools that will help me achieve success in my career. Journal entries are important in helping an individual complete their work by incorporating all the steps involved in the process of developing a project. In this case, it is important to point out that a step-by-step entry of the process of developing the process was crucial in including all the steps that necessitated the planning and consequent implementation of the project. While the overall objective of these journal entries was to help me achieve my objectives of the project by developing an effective implementation plan, it is crucial to point out that the journal entries provided me with the skills of being an effective planner by organizing my work. The knowledge and skills learnt will be crucial in my future practice since I will be able to develop and implement solutions based on the entries that I will be making in my journals, which will help me advance my nursing career. While the journal was crucial during my practicum and the consequent implementation of the project, it is crucial to point out that a continuous review of my practicum journal entries will be crucial in providing insights on the approaches that I should have taken to achieve a higher level of success than the one I achieved. In this case, the review will provide me with revelations about strategies that I used and were not appropriate at the time of implementing the project. Other than this, a future review will also provide me with the approaches that I would have used to make modifications, which I cannot be able to identify at the moment. In this case, the development of a set of knowledge and skills based on the review of the practicum journal