How Many Elements Can Be Found Naturally

There are 118 elements currently on the periodic table. Several elements have only been found in laboratories and nuclear accelerators. So, you may wonder how  many elements can be found naturally. The usual textbook answer is 91. Scientists used to believe that, except for the element technetium, all the elements up to element 92 (uranium)  could be  found in nature. However, it turns out there are other elements that occur in trace amounts naturally. This brings the number of naturally occurring elements to 98. New Naturally Occurring Elements Technetium is one of the newer elements added to the list. Technetium is an ​element with no stable isotopes. It is produced artificially by bombarding samples of molybdenum with neutrons for commercial and scientific uses and was widely believed to be nonexistent in nature. This has turned out to be untrue. Technetium-99 can be produced when uranium-235 or uranium-238 undergoes fission. Minute amounts of technetium-99 have been found in uranium-rich pitchblende. Elements 93–98 (neptunium, plutonium, americium, curium, berkelium, and californium) were all first artificially synthesized and isolated in the Lawrence Berkeley National Laboratory at the University of California, Berkeley. They have all been found in the fallout of nuclear testing experiments and byproducts of the nuclear industry and were believed to exist only in man-made forms. This also turned out to be untrue. All six of these elements have been found in very small amounts in samples of uranium-rich pitchblende. Perhaps one day, samples of element numbers greater than 98 will be identified. List of Elements Found in Nature The elements found in nature are elements with atomic numbers 1 (hydrogen) through 98 (californium). Ten of these elements occur in trace amounts: technetium (No. 43), promethium (61), astatine (85), francium (87), neptunium (93), plutonium (94), americium (95), curium (96), berkelium (97), and californium (98). The rare elements are produced by radioactive decay and other nuclear processes of more common elements. For example, francium is found in pitchblende as the result of alpha decay of actinium. Some elements found today may have been produced by the decay of primordial elements—elements produced earlier in the history of the universe that have since vanished. Native vs. Natural Elements While many elements occur in nature, they might not occur in pure or native form. There are only a few native elements. These include the noble gases, which dont readily form compounds, so they are pure elements. Some of the metals occur in native form, including gold, silver, and copper. Nonmetals including carbon, nitrogen, and oxygen occur in native form. Elements that occur naturally, yet not in native form, include the alkali metals, alkaline earth, and rare earth elements. These elements are found bound in chemical compounds, not in pure form.

Mission, Vision, And Values Assessment For Fast Food...

MGMT615/Week 2 Assignment: Mission, Vision, and Values Assessment for Fast Food Restaurants Deborah D. Shamlin American Military University Mission, Vision, and Values Assessment for Fast Food Restaurants Every day there is increasing competition in the fast food industry and it is critical that senior executives stay ahead of the competition by ensuring that their company has a clearly articulated and well-developed strategic vision. The first stage of the strategic management process involves â€Å"developing a strategic vision, mission statement, and set of core values† (Thompson, Peteraf, Gamble Strickland, 2015). During this early stage, it is critical that senior company leaders diligently evaluate the current path to determine if they are positioning the company for continued success or if it needs modification. Having a clear mission statement—which defines â€Å"who we are, what we do, and why we are here†Ã¢â‚¬â€helps ensure that employees understand their purpose and can work diligently toward achieving organizational goals (Thompson et al, 2015). A strategic vision lays out where a company would like to be in the future, allowing it to grow beyond current situations and increase profitability. Finally, the values of an organization serve as a guide on acceptable behaviors and traits which should help direct employees toward achieving the mission and strategic vision. This paper will examine the mission, vision and values of three successful and well-establishedShow MoreRelatedThe Box, Inc.1530 Words   |  7 PagesIntroduction Jack in the Box, Inc. opened its first restaurant in 1951. 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Thtr 100 Free Essays

1. __________ argued for light as the guiding principle of all design and defined the role of the modern lighting designer. Adolphe Appia 2. We will write a custom essay sample on Thtr 100 or any similar topic only for you Order Now A member of the audience may see a play from five different critical and dramaturgical perspectives. What are five perspectives? social, personal, artistic, theatrical, and entertainment value 3. All plays and play productions can be usefully analyzed and evaluated on the way they use the theatrical format to the best advantage and make us rethink the nature of theatrical production. true 4. Avant-garde means, literally, â€Å"the major assault† or â€Å"shock troops. † true 5. Dramatic criticism usually appears in all the following forms EXCEPT annotated versions of a playscript used in production. 6. Dramaturgy is essentially a subset of directorial responsibilities false 7. Eschewing realism, romanticism, and rationality to create relentlessly unenlightening plays, which playwright said, â€Å"Art has nothing to do with clarity, does not dabble in the clear, and does not make clear? Samuel Beckett 8. Flashbacks that are not clearly framed as such, shuttling instead between time zones without narrative warning, are examples of nonlinear theater 9. Founded by Luis Valdez in 1965, which contemporary Chicano theatre was created to dramatize the farm workers’ situation in California through didactic actos? Teatro Campesino 10. Generally the playwright is more intelligent and better informed than the members of the audience. false 11. How did Stanislavsky contribute to realist theatre? He brought realist acting to realist plots 12. If you were to join a discussion about macaronic drama, you would be chatting about plays that include speeches in different languages. 13. In describing dramatic space as â€Å"psycho-plastic,† which â€Å"scenographer† (Europe’s most celebrated in the 20thcentury) said â€Å"The goal of a designer can no longer be a description of a copy of actuality, but the creation of its multidimensional model? Joseph Svoboda 14. Opera bouffe is a type of lightweight, sentimental musical. false 15. Plays that deal with theatrical matter not simply as a vehicle but as a theme are called metadrama or metatheatre. 16. Postmodern playwrights and directors are mainly concerned with the discontinuity meaning 17. Postmodernism relates to previous artistic movements in all the following ways EXCEPT postmodern theatre attempts to illuminate the received truths of How to cite Thtr 100, Papers