Calcium Facts - Ca or Atomic Number 20

Calcium Facts - Ca or Atomic Number 20 Calcium is silver to gray solid metal that develops a pale yellow tint. It is element atomic number 20 on the periodic table with the symbol Ca. Unlike most transition metals, calcium and its compounds exhibit a low toxicity. The element is essential for human nutrition. Take a look at calcium periodic table facts and learn about the elements history, uses, properties, and sources. Calcium Basic Facts Symbol: CaAtomic Number: 20Atomic Weight: 40.078Classification: Alkaline EarthCAS Number: 7440-701-2 Calcium Periodic Table Location Group: 2Period: 4Block: s Calcium Electron Configuration Short Form: [Ar]4s2Long Form: 1s22s22p63s23p64s2Shell Structure: 2 8 8 2 Calcium Discovery Discovery Date: 1808Discoverer: Sir Humphrey Davy [England]Name: Calcium derives its name from the Latin calcis which was the word for lime (calcium oxide, CaO) and limestone (calcium carbonate, CaCO3)History: The Romans prepared lime in the first century, but the metal was not discovered until 1808. Swedish chemist Berzelius and Swedish court physician Pontin created an amalgam of calcium and mercury by electrolyzing lime and mercury oxide. Davy managed to isolate pure calcium metal from their amalgam. Calcium Physical Data State at room temperature (300 K): SolidAppearance: fairly hard, silvery white metalDensity: 1.55 g/ccSpecific Gravity: 1.55 (20  °C)Melting Point: 1115 KBoiling Point: 1757 KCritical Point: 2880 KHeat of Fusion: 8.54 kJ/molHeat of Vaporization: 154.7 kJ/molMolar Heat Capacity: 25.929 J/mol ·KSpecific Heat: 0.647 J/g ·K (at 20  °C) Calcium Atomic Data Oxidation States: 2 (most common), 1Electronegativity: 1.00Electron Affinity: 2.368 kJ/molAtomic Radius: 197 pmAtomic Volume: 29.9 cc/molIonic Radius: 99 (2e)Covalent Radius: 174 pmVan der Waals Radius: 231 pmFirst Ionization Energy: 589.830 kJ/molSecond Ionization Energy: 1145.446 kJ/molThird Ionization Energy: 4912.364 kJ/mol Calcium Nuclear Data Number of Naturally Occurring Isotopes: 6Isotopes and % Abundance: 40Ca (96.941), 42Ca (0.647), 43Ca (0.135), 44Ca (2.086), 46Ca (0.004) and 48Ca (0.187) Calcium Crystal Data Lattice Structure: Face-Centered CubicLattice Constant: 5.580 Ã…Debye Temperature: 230.00 K Calcium Uses Calcium is essential for human nutrition. Animals skeletons get their rigidity primarily from calcium phosphate. The eggs of birds and shells of mollusks are comprised of calcium carbonate. Calcium is also necessary for plant growth. Calcium is used as a reducing agent when preparing metals from their halogen and oxygen compounds; as a reagent in purification of inert gases; to fix atmospheric nitrogen; as a scavenger and decarbonizer in metallurgy; and for making alloys. Calcium compounds are used in making lime, bricks, cement, glass, paint, paper, sugar, glazes, as well as for many other uses. Miscellaneous Calcium Facts Calcium is the 5th most abundant element in the Earths crust, making up 3.22% of the earth, air, and oceans.Calcium is not found free in nature, but calcium compounds are common. Some of the most common compounds found on Earth are limestone (calcium carbonate - CaCO3), gypsum (calcium sulfate - CaSO4 ·2H2O), fluorite (calcium fluoride - CaF2) and apatite (calcium fluorophosphate - CaFO3P or calcium chlorophosphate - CaClO3P)The top three countries that produce calcium are China, United States and India.Calcium is the main component of teeth and bones. However, too much calcium can lead to kidney stones or artery calcification.Calcium is the fifth most abundant element in the human body. Approximately one third of the mass of the human body is calcium after all water is removed.Calcium burns with a dark red color in a flame test.Calcium is used in fireworks to deepen the color. Calcium salts are used to produce orange in fireworks.Calcium metal is soft enough to cut with a knife, a lthough somewhat harder than the metal lead. People and other animals can often taste the calcium ion. People report is as contributing a mineral, sour, or salty flavor.Calcium metal reacts exothermically with water or acid. Skin contact with calcium metal can cause irritation, corrosion, and chemical burns. Ingesting or inhaling calcium metal can be fatal due to the burns it can produce. Sources Hluchan, Stephen E.; Pomerantz, Kenneth (2006)  Calcium and Calcium Alloys. Ullmanns Encyclopedia of Industrial Chemistry.  Weinheim: Wiley-VCH, doi:10.1002/14356007.a04_515.pub2Greenwood, Norman N.; Earnshaw, Alan (1997). Chemistry of the Elements (2nd ed.). Butterworth-Heinemann. ISBN 0-08-037941-9.

How successful was Lord Liverpool in responding to radical challenge from 1812-1822 Essays

How successful was Lord Liverpool in responding to radical challenge from 1812-1822 Essays How successful was Lord Liverpool in responding to radical challenge from 1812-1822 Paper How successful was Lord Liverpool in responding to radical challenge from 1812-1822 Paper To look at how successful Lord Liverpool was in responding to radical challenge, you have to look at what were the radical challenges in this period, what was causing the unrest thought the country. Then you have to look at what Lord Liverpool did to resolve the unrest and stop the challenges. 1815-1820 was a time of unrest; however unrest was not generally revolutionary. Even if Liverpools actions were seen as repressive he had to nip revolution in the bud. For example with the spa fields Meetings. This was a series of mass meetings (mainly in London) and it was aimed to inspire people and to intimidate the authorities. As a result, parliament sanctioned the suspension of Habeas Corpus and passed A Seditious Meeting Act, which meant that people could be held without evidence or a trial for as long as the government needed and it meant that no groups larger than 50 people could gather or have a meeting and talk about politics or revolution. However some critics say that this does not prove he was successful because the suspension of Habeas Corpus only lasted a couple of years. This is just one way in which the government responded to radical challenges during this period. Some historians say that this was very successful and radical challenge drooped as a result, however some say that this forced these radical groups underground and just inspired more people. The government had to nip revolution in the bud because at the time the government had to many weaknesses that revolutionary groups could take advantage of like the fact that Britain was in national debt had risen by  £64 million from 1739 to 1816, the government had to rely on yeomanry which was a small armed forced and if a riot got out of control then they would not be able to stop them and most importantly Liverpool did not have the benefit of hindsight. He did not know that there wasnt going to be a revolution so he had to respond quickly and decisively to stop radical challenges/challenges growing. Unrest in the country was due to many reasons such as: the Corn Laws, the abolition of income ta x, war time contracts had ended and the demobilisation meant that there was high unemployment. Some historians say that Lord Liverpool did not address unrest, but he made it worse by introducing silly little policies like the Corn Laws. The Corn Law guaranteed protection for wheat prices for the agricultural or landowner interest from foreign imports of grain. The concept was not new. A similar law had been introduced in 1804 but to guarantee 80 shillings a quarter ( £4. 00) per quarter tonne or  £16 per tonne for producers before foreign grain was permitted to enter the British market seemed to government critics a little excessive. The whole point of the bill, as far as the government was concerned, was to guarantee landowners profits at a level to which they had become accustomed during the war. Most people saw it as apiece of class legislation in that it saved the landowners from cheaper foreign grain, established prices and made it more expensive for the consumer. This did not help the situation at all, in actual fact this just manifested more unrest thought the country and revolutionary groups took advantage of this. It is fair to say that the country was at a time of unrest; however some say that the government did not do anything constructive but just made the situation worse. the corn laws proves this but also the abolition of income tax in 1816 was a measure which benefited the rich but, because it led to a large increase in indirect taxes on tea, sugar, tobacco, beer and salt, which was harmful to the poor. War time contracts had ended and farmers and manufactures found themselves over producing because there was not enough demand for products. This meant that people had to be fired and business went into liquidation. With the demobilisation there was huge unemployment and this did not help as more and more people got tired of not having money and people were starting to starve. With all of these reasons causing unrest thought the country people stated to want change within the government. The government saw this as a problem and thought that there was going to be a revolution so their actions were to nip revolution in the bud. They felt they had to do whatever necessary to stop revolution. The historians that say the country was close to a revolution in the period 1815-1822 tend to emphasise the sheer volume of radical activity during this period. However those historians say that they threat of revolution was just a huge exaggeration point to the lack of coordination between the individual instances of protest and the states continued ability to respond decisively to it. Most historians say that the popular protest which characterised the immediate post-war periods was essentially traditional a not political but were related to the economic distress at the time. Most historians agree that the activity was economically motivated. During the period from 1816-1821 there was a series of mass meetings which were organise by radical groups. These were called the Spa Field Meetings. Most historians agree that the meetings were aimed at both inspiring the public and intimidating the authorities. The Spenceans were the organiser of the first few meetings. The Spenceans supported revolution but it is not clear as to whether plans were being made for revolution at the time of the Spa Fields Meetings. The first meeting saw a massive 20,000 people attend and was peaceful, however there were a few who after walked through Westminster and started smashing windows at high prices. In the second meeting around 200 people marched towards the tower of London, looting a gun shop on the way. The March of the Blanketeers was a march organised by William Benbow in March 1817. The marchers aims were to present a petition to the Prince Regent, asking him to relieve distress in the northern textile districts. Around 4,500 Blanketeers gathered in Manchester to protest in London. The Peterloo Massacre was when a crowd of around 60,000 gathered at St Peters Field on 16 August 1819 to demonstrate. Magistrates sent in the Manchester yeomanry at arrest the leader Hunt just after the meeting had begun. Because of the amount of people the yeomanry found it very hard to get to Hunt so the magistrates called in the regular forces to hep the engulfed yeomanry and in the panic a stampede followed and 11 people were killed and 400-600 were injured. All of these incidences were seen as a starting point for a revolution. We are now going to look at what the government did in response to these actions. It is commonly alleged that Liverpools government pursued repressive policies between 1815 and 1820. It acted in an unnecessarily harsh manner in crushing popular protest by, for example, suspending Habeas Corpus, passing the Seditious Meetings Act and breaking up the march of the Blanketeers in 1817, massacring those at Peterloo and passing the Six Acts in 1819. Much disorder was actually provoked by the government either indirectly through policies which placed intolerable burdens upon the poor or directly through the practice of employing agents provocateurs who encouraged lawbreaking so that they could collect a reward by informing on the law breakers. Following the Spa Fields meetings in December 1816, the government reacted by suspending Habeas Corpus. This meant that the government could hold someone suspected of radical or anti-government behaviour without trial for an indefinite period. Only 44 were arrested on suspicion of treason, of which 37 were detained when Habeas Corpus was partially suspended in February 1817. One of these was released soon after, whilst a second was discharged on compassionate grounds and a third died in custody. The remaining 34 had all been released by the time Habeas Corpus was fully restored in January 1818. As Norman Gash said It was not exactly a reign of terror. The government did have good right to suspend Habeas Corpus and introduce the Seditious Meetings Act because at the first Spa Fields Meeting Act there were over 20,000 people who attended and went rioting around London. On the second meeting 200 people marched to the Tower of London and Looted a gun shop on the way. The government saw this as a wake up call and had to introduce these policies or a revolution would take place they had to nip revolution in the bud. As a direct result of the Seditious Meeting Act, in the same month there where large scale gatherings for political purposes were banned. A small group of disorganised workers planned a march from St Peters field in Manchester to London to present their grievances to the Prince Regent in person. The protest was mainly peaceful and carried out in a legal fashioned in defiance of the government legislation. One marcher was killed in a heavy handed and needless display of brutality by the authorities in Stockport Cheshire. Local Magistrates declared that the initial gathering was seditious and dispersed it. This just created more unrest and most people saw this as going to far, however other historians say that he had to nip revolution in the bud. How was Lord Liverpool to know that there was not gong to revolution? Lord Liverpool saw a large group of people marching at a time of unrest this was the only action he could take because he could not afford to do nothing. The Peterloo Massacre has been called a symbol of repression by some historians, however some people have said that this was not a decision made by Lord Liverpool but by magistrates and they did not set our to stop the demonstration but just to get Hunt. Some historians say that the radical challenges in this period were such a threat that the government needed to take immediate action to deal with the threat and could not take any chances so repressive measures needed to be taken to nip revolution in the bud. However some historians say that these radical groups were regionally divided, had no weaponry and had poor organisation and end goals to be a serious threat. Looking at how successful Lord Liverpool was in dealing to radical challenges you have to remember how pitifully small Liverpools resources were for keeping the peace. Lacking a sizeable standing army or an effective police force, Liverpools government was obliged to rely upon spies and informers. The government at the time did not have any really power so they had to nip revolution in the bud. There was huge unrest thought the country due to various reasons and this led to radical protests. All of the protests were seen by the government as a starting point for a revolution and so the government had to deal with them through repressive policies. Liverpool had to stamp any possible radical challenges and he did this successfully.

Enhancing Organisational Transparency through Talent and Performance Dissertation

Enhancing Organisational Transparency through Talent and Performance Management - Dissertation Example Likert scale method is a type of ordinal measurement that was used in the measurement of the online research respondents’ attitude to each of the given questions related to organizational transparency, talent management, and performance management. As part of the five major categories of the online research respondents’ responses from strongly agree = 5 to strongly disagree = 1. When using the likert scale method, Jamieson (2004) explained that statistical data should be computed using either mode or median when measuring the central tendency of the figures to avoid manipulating the ordinal data. In terms of analyzing the qualitative research findings, strategic ways on how researcher can effectively analyze the qualitative research findings that minimizes the risk of developing bias judgment will be tackled in details. Quantitative Analysis Quantitative data in this study were gathered out of the online survey study. In line with this, a total of 135 randomly selected online research respondents voluntarily agreed to participate in this study. Most of the online survey respondents have been working in middle management (53.7%), senior management (15.7%), and junior management (30.6%) between 2 to 7 years in their current work position. Out of the total online survey respondents, 97% and 3% were UAE nationals and Non-UAE Nationals respectively who are currently working in Dubai government (56%) and semi-government organizations (44%). Because of the long-term exposure of the online research respondents in terms of working in Dubai government and semi-government organizations, the online research respondents are considered highly qualified in terms of providing their personal opinion with regards to the impact of organizational transparency in enhancing the talent and performance management in Dubai. Majority with 64.4% of the total research respondents are female whereas the remaining portion is composed of male respondents who are UAE nationals a nd are currently employed in Dubai’s government departments and semi-government organizations. This study assumed that individuals who are working in Dubai’s government departments and semi-government organizations between the age brackets of 25 to 35 are the ones who are more vocal about the significance of organizational transparency on talent and performance management in Dubai. This assumption is confirmed by the quantitative results given that majority with 65.2% of the total research respondents belong to the said age group. Other online research respondents either belong to age group of less than 25 years old (20%) or between 36 to 46 years old (14.8%). Talent Management Most of Dubai government and semi-government organizations’ employees enjoy the benefit of career improvements as a result of incorporating the importance of learning in working practices. Based on the likert

Environmental Psychology Article Analysis Research Paper

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Japanese and Chinese Styles comparison - Research Paper Example Japan’s offenses of omission in dealing fully with its past marks as hindrance to its present overseas policy, but they pale in contrast with China’s historical sense of entitlement to local hegemony and its strong new form of condition-sanctioned anti-Japanese patriotism. China’s tactful language emphasizes toeing party’s line history rather than discriminating present-day interests, and it presumes that only one position in international affairs more often than not China’s — can be correct (Hagstrà ¶m 9) China today has much more to gain from association with Japan than from disagreement. Harping about past inflaming and sins the disputes over the islands do little good. If republic of China is to become the main power in the region, it can only do so with Japan, not next to it. As Germany and France have confirmed, ideas can change when government’s interest demands it. But changing Beijing’s thinking from hierarchy to collaboration will require strong leadership and a nuanced indulgent of national interests. China’s new leaders haven’t inspired much hope of either (Hunt 17). Socially, Japan developed on the Shogun ate life in which society revolved around honoring the emperor while maintaining a familys personal respect. The samurai, compared to the knight in the western European society, was one of the most accepted figures in Japanese society. While Post-modern China was also imperial in nature, China went without the Samurai system and instead relied heavily on a national army and private army. China and Japan both claim to be the shareholders of over  East China Sea  islets that China calls it the  Diaoyu Islands and Japan refer to it as Senkaku Islands. Tensions have been high from 2012 September, when Japanese government acquired three of the islets from private Japanese proprietor. This leads

Supply chain management Essay Example | Topics and Well Written Essays - 750 words - 6

Supply chain management - Essay Example In this regard, the essay helps in developing a better understanding of the various concepts related with the SCM and lean manufacturing through the effective analysis of the advantages as well as disadvantages related with the system. The current issue that are identifiable within the business is to enhance the efficiency of SCM that is operating within an organization. Organisations operating in the present domain are having different set of SCM processes and needs to be handled in a separate manner to enhance the ability of the same. The issues arising from operations of SCM is even different based on the varied organisational perspective. Some common issues faced within the domain of SCM are identified within the operational area of an organization. The major issues identifiable within an organisation are mostly in the operational areas related with the configuration of distribution network, inventory control and outsourcing. The effective maintenance and handling of the different processes of production is noted to be affecting the needs of the business and further hindering the operations of an organisation (Womack, & Jones, 1994). Lean manufacturing process includes a series of steps that are involved with value creation for the customers, continuous improvement as well as eliminating waste among others. Lean SCM could effectively handle specific issues related with production as well as other operations within the domain of SCM. Through the effective management of the production, cycle lean would help in developing the SCM that is operating within the domain of organisational operations (Holweg, 2007). To enhance the efficiency of lean, it should focus on the waste management of over effective production to ensure a sustainable development for organizations practising lean manufacturing. An organization needs to maintain its level of consumers and ensure the timely production of goods this could be effectively handled by

Building technology Essay Example | Topics and Well Written Essays - 2000 words

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