10 Calcium Element Facts You Should Know

10 Calcium Element Facts You Should Know Calcium is one of the elements you need in order to live, so its worth knowing a little bit about it. Here are some quick facts about the element calcium. Fast Facts: Calcium Element Name: CalciumElement Symbol: CaAtomic Number: 20Standard Atomic Weight: 40.078Discovered By: Sir Humphry DavyClassification: Alkaline Earth MetalState of Matter: Solid Metal Calcium is element atomic number 20 on the periodic table, which means each atom of calcium has 20 protons. It has the periodic table symbol Ca and an atomic weight of 40.078. Calcium isnt found free in nature, but it can be purified into a soft silvery-white alkaline earth metal. Because the alkaline earth metals are reactive, pure calcium typically appears dull white or gray from the oxidation layer that quickly forms on the metal when its exposed to air or water.  The pure metal can be cut using a steel knife.Calcium is the 5th most abundant element in the Earths crust, present at a level of about 3% in the oceans and soil. The only metals more abundant in the crust are iron and aluminum. Calcium is also abundant on the Moon. It is present at about 70 parts per million by weight in the solar system.  Natural calcium is a mixture of six isotopes, with the most abundant (97%) being calcium-40.The element is essential for animal and plant nutrition. Calcium participates in many b iochemical reactions, including building skeletal systems, cell signaling, and moderating muscle action.  It is the most abundant metal in the human body, found mainly in bones and teeth. If you could extract all of the calcium from the average adult person, youd have about 2 pounds (1 kilogram) of the metal.  Calcium in the form of calcium carbonate is used by snails and shellfish to construct shells. Dairy products and grains are the primary sources of dietary calcium, accounting or about three-quarters of dietary intake. Other sources of calcium include protein-rich foods, vegetables, and fruits.Vitamin D is essential for calcium absorption by the human body. Vitamin D is converted to a hormone which causes intestinal proteins responsible for calcium absorption to be produced.Calcium supplementation is controversial. While calcium and its compounds are not considered to be toxic, ingesting too many calcium carbonate dietary supplements or antacids can cause milk-alkali syndrome, which is associated with hypercalcemia sometimes leading to fatal renal failure. Excessive consumption would be on the order of 10 g calcium carbonate/day, though symptoms have been reported upon ingesting as little as 2.5 g calcium carbonate daily.  Excessive calcium consumption has been linked to kidney stone formation and artery calcification.Calcium is used for making cement, making cheese, removin g nonmetallic impurities from alloys, and as a reduction agent in the preparation of other metals.  The Romans used to heat limestone, which is calcium carbonate, to make calcium oxide. The calcium oxide was mixed with water to make cement, which was mixed with stones to build aqueducts, amphitheaters, and other structures that survive to the present day. Pure calcium metal reacts vigorously and sometimes violently with water and acids.  The reaction is exothermic. Touching calcium metal can cause irritation or even chemical burns. Swallowing calcium metal can be fatal.The element name calcium comes from the Latin word calcis or calx  meaning lime.  In addition to occurrence in lime (calcium carbonate), calcium is found in the minerals gypsum (calcium sulfate) and fluorite (calcium fluoride).Calcium has been known since the 1st century, when the ancient Romans were known to make lime from calcium oxide.  Natural calcium compounds are readily available in the form of calcium carbonate deposits, limestone, chalk, marble, dolomite, gypsum, fluorite, and apatite.Though calcium has been known for thousands of years, it was not purified as an element until 1808 by Sir Humphry Davy (England). Thus, Davy is considered to be the discoverer of calcium. Sources Greenwood, Norman N.; Earnshaw, Alan (1997). Chemistry of the Elements (2nd ed.). Butterworth-Heinemann. p. 112.Parish, R. V. (1977).  The Metallic Elements. London: Longman. p.  34.Weast, Robert (1984).  CRC, Handbook of Chemistry and Physics. Boca Raton, Florida: Chemical Rubber Company Publishing. pp.  E110.​

Free Essays on Promotion And Price Analysis

The tobacco industry consists of many competitors trying to satisfy a specific customer need. Companies such as Philip Morris, RJ Reynolds, Brown and Williamson, and Lorillard hold almost the entire market share in the tobacco industry. While each company has different advertising and marketing techniques, they all target the same customer group. Tobacco companies try their best to generate interest in their particular brand or brands. Companies market a number of attributes that usually include, but are not limited to: taste, flavor, strength, size and image in order to distinguish themselves from competitors. However, all tobacco companies are satisfying the same needs. The tobacco industry has many ways they convey their promotional messages. They have limited media coverage due to government restrictions that have been placed over the past two decades. The tobacco companies have been prohibited from advertising on television and radio, and even more recently from billboards and outdoor posters because of the harmful side effects their products may cause. Since so many channels of marketing are closed for the tobacco industry, magazines are the most common method of advertising. Even with magazines and other legal forms of advertising, tobacco makers are still running into restrictions. In each magazine advertisement, a Surgeon General's warning is required to appear with information about tobacco-related health risks that the product may lead toward. Companies have also been required to create advertisements solely about the harmful consequences of using tobacco products. These ads were a result of an advertising war between the tobacco industr y and anti-tobacco campaigns. The tobacco companies were mocking the ads and celebrating those who continued to use tobacco. The government intervened and required the "tobacco warning advertisements" for all tobacco companies. The government has also intervened with tobacco marketing b... Free Essays on Promotion And Price Analysis Free Essays on Promotion And Price Analysis The tobacco industry consists of many competitors trying to satisfy a specific customer need. Companies such as Philip Morris, RJ Reynolds, Brown and Williamson, and Lorillard hold almost the entire market share in the tobacco industry. While each company has different advertising and marketing techniques, they all target the same customer group. Tobacco companies try their best to generate interest in their particular brand or brands. Companies market a number of attributes that usually include, but are not limited to: taste, flavor, strength, size and image in order to distinguish themselves from competitors. However, all tobacco companies are satisfying the same needs. The tobacco industry has many ways they convey their promotional messages. They have limited media coverage due to government restrictions that have been placed over the past two decades. The tobacco companies have been prohibited from advertising on television and radio, and even more recently from billboards and outdoor posters because of the harmful side effects their products may cause. Since so many channels of marketing are closed for the tobacco industry, magazines are the most common method of advertising. Even with magazines and other legal forms of advertising, tobacco makers are still running into restrictions. In each magazine advertisement, a Surgeon General's warning is required to appear with information about tobacco-related health risks that the product may lead toward. Companies have also been required to create advertisements solely about the harmful consequences of using tobacco products. These ads were a result of an advertising war between the tobacco industr y and anti-tobacco campaigns. The tobacco companies were mocking the ads and celebrating those who continued to use tobacco. The government intervened and required the "tobacco warning advertisements" for all tobacco companies. The government has also intervened with tobacco marketing b...

Study for Insurance Covers(Australia) Essay Example | Topics and Well Written Essays - 3250 words

Study for Insurance Covers(Australia) - Essay Example Accidental breakage of glass, mirrors etc. will get insurance cover under this policy. For fixed glass that forms part of the building including fixed shower bases, basins, sinks, baths and toilets the insurance cover is available. Mirrors, glassware, crystal, crockery, china (except when being used, cleaned or carried) or glass in furniture (except for glass which forms part of a television or a computer screen/monitor. Items covered for accidental breakage include fixed glass like window tinting or shatter- proofing material attached to the glass on the insured buildings. If we insured the contents, any mirrors, glassware, crystal, crockery or any glass in furniture .Mirrors, glassware, crystal, crockery or china are not covered while they are being used, cleaned or carried by hand. The most the CGS will pay for any one item, pair, set, collection or system is $20000.The contents worth more than $20000 will have to include each as a special content item .To do this the insured must advise the CGS and the items will be listed on the insured’s schedule. For each claim for the building and contents the CGS will reduce the amount they pay for claim by the excess. The amount of excess is shown on the insured’s schedule. The most the CGS will pay for any claim for building or contents is the sum insured shown on the insured’s schedule. In case of additional things this condition is not applied. The cost of rebuilding or repairing the damaged portion of the insured building will be paid by the CGS if the schedule shows â€Å"including replacement benefit.† (Accidental Damage. 2006, p. 53). From the analysis of the terms and conditions of the Essentials Plus home and content insurance policy we can see that Rob’s damaged vessel is included in the term contents in the CGS policy and it is sure that the damage is not caused during