Assignments Essay

exact one scientist involved in gradulating the modern day-to-day card and chance upon why their work made a epoch-making contribution to the cultivation of the biweekly circumvent. Dmitri Mendeleevs contribution to the modern day periodic delay is widely renowned in the record of chemical science. Mendeleev was the creator of the periodic board arranging 63 admitn components in order of their nuclear mass. His discovery made a significant impact in the suppuration of the periodic table as it set the foundation for further occur to occur in the future.Dmitri Mendeleev anticipated the existence of forward-looking components to be ascertained, consequently leaving gaps in the ascending order of cistrons. Mendeleev was the nonable discoverer of isotopes and r are gasses. In summary, science is a blend of logic and imagination and Mendeleev demonstrate these attributes through developing the periodic table (Western Oregon University, 2012). Dmitri Mendeleevs entr y of the periodic table was considered one of the greatest triumphs in chemistry history as it wholeowed for further exploration to begin. Why do you think the ontogeny of the periodic table required input from a range of diametric people?As many are aware, the development of the periodic table required numerous scientists much(prenominal) as John Newlands and Julius Lothar Mieyer. If not for these men, Mendeleevs table would not be as accurate as it is today. As time progressed, technology advanced scientists discovered noble gasses and fit(p) all(prenominal) elements atomic mo. Many scientists played a vital role in developing our modern day periodic table as apiece person had a different knowledge and understanding of chemistry. To conclude, the periodic table was never one mans discovery, but the result of numerous scientists explorations and experimentations.Each played a vital part in challenge/confirming the theories of their predecessors, recognising different bod s and properties between different elements. How did improvements in technology influence the development of the periodic table? With the improvement in technology from the 1800s through to present day the development of the periodic table has undergone significant variegates. Since the development of the table by Dmitri Mendeleev in 1869, scientists have utilised refreshed technologies to produce a more accurate representation of the chemical elements.Scientists such(prenominal) as William Ramsay, who discovered noble gasses, drastically changed the periodic table adding a whole new group. In 1913, Henry Mosely significantly affected the periodic table with his discovery of nuclear charge. Ultimately, the nearly technological change is attributed to Glen Seaborg in 1940. His work on the discovery of atomic number reconfigured the periodic table, apportion him the noble prize in chemistry in 1951. Without technological advancements such as nuclear reactors, telescope and the ch emical bonds system (Alexander Crum Brow)). Seaborg possibly would not have been able to discover what he did.In summary, the advancement in technology has importantly altered Mendeleevs original periodic table and will most likely continue with new synthetic elements world added. Briefly describe information we now have about atoms that was not available to earlier scientists who were identifying patterns and trends inwardly primordial versions of the periodic table. What trends could they see, compared to what we now know? In the 20th Century, scientists have a greater understanding of atoms and the patterns they line compared to those who invented the early versions of the periodic table.It was noted in the early 1800s, that matter consisted of stumpy particles called atoms. Towards the end of the century, J. J Thompson discovered electrons and their electro interdict charge. He hypothesised that atoms would therefore throw positive charged particles. In 1869, scientists be gan to recognised patterns in properties originating from a number of cognise elements, eventually developing the classification methods. During the early versions of the periodic table, it was determined by Henry Mosely to arrange elements in order of their atomic number.This pattern followed the periodic table concept more accurately than the arrangement of atomic weight. Another notable trend originated from glen Seaborg in the 1940s. Seaborg artificially produced new cogent mass elements such as neptunium and plutonium. Thus creating a new block in the table called antinides. To conclude our knowledge of atoms, their social system and patterns they form in the periodic table originating from the 18th century has developed. Essay donation This essay will provide a clear insight into the element of atomic number 17.It will include detail on the history of chlorine, its structure, position on the periodic table and the ions formed. The element of centilitre was discovered quit e early compared to many other elements. Carl Wilhelm Scheele first produced the element in 1774 in Sweden. Scheele came across this element after combining the mineral pyrolusite and hydrochloric acid together. He discovered that this new gas reacted with metals, dissolved slightly in water and discolor flowers and leaves. At first, Scheele believed that the gas produced was oxygen, however Sir Humphry Davy proved in 1810 that this gas was new.Sir Davy therefore went on to name the new substance atomic number 17 after the Greek word (Chloros) meaning greenish yellow. chlorines element structure is similar to other elements that are situated in the halogens group on the periodic table. This element comprises an atomic number of 17 and weight of 35. 5. Chlorine is cognise to be an extremely reactive gas therefore providing reasons as to why it directly combines with the majority of other elements except for the noble gasses. This element is arranged into three shells. The firs t two shells are filled with electrons. lag the third contains only sevener electrons. Chlorine is a naturally occurring element, arising in the domains crust and seawater. Its abundance in the Earth is about 100-300 parts per million (Chemistry Explained, 2013). This element is considerably well known to be a dense gas, containing a density rating of 3. 21g per litre. Chlorine is quite a strong oxidizing agent. In other words, it is notorious for victorious on electrons from other substances. Nevertheless, the element chlorines specific element structure dictates as to why it is positioned within the halogens group.Chlorine has been specifically positioned within the periodic table situated in group 17 because it belongs to the halogens family. It is known to be the arcsecond lightest element in the halogens group. Chlorine is situated in this group because it contains similar chemical properties to other halogen family members. Some chemical and physical properties of these e lements are that are very reactive, they contain seven valence electrons, they are poor conductors and they are brittle when solid.Chlorine has a melting exhibit of -100. 98Cand a boiling point of -34. C. Chlorine is heavier than air and proved very effective as a chemical weapon in the trenches and fox holes dug in World War One. Chlorine has been specifically positioned towards the top end of the halogens as it holds a notably low atomic number compared to other elements that are also a part of the same(p) group. In summary, Mendeleev and Seaborg essentially position chlorine within the halogens group imputable to its similar characteristics. The elements included in the halogens group are fluorine (F), chlorine (Cl), bromine (Br), iodine (I), and astatine (At).Fluorine and chlorine, both have seven valence electrons in their outer shell. That seven-electron peculiarity applies to all of the halogens. They are all just one electron shy of having full shells. The halogens have th e trait of combining with many different elements. They are very reactive. You will frequently find them bonding with metals and elements from Group One of the periodic table. Fluorine is the most reactive of the halogens and reactivity decreases as you move down the column. Therefore, Chlorine is the second most reactive. As the atomic number increases, the atoms get bigger.Their chemical properties change just a small amount when compared to the element right supra them on the table. Chlorine forms a negative ion by reason of a greater amount of electrons than protons. This atom has 17 protons and electrons. Due to the last provide electron shell, this element transforms into a negative ion. In simpler terms, a negative ion contains one more electron than proton. In scientific language, a negative ion is otherwise known as an anion. Chlorine is converted into an ion once gaining an particular(a) electron from a different element. This process is essential for creating an loft bond.Chlorines ion is known to be extremely soluble in water, thusly giving reasons as to why it bonds with sodium, forming sodium chloride. The ionic bond that forms is mensurable in terms of valence, meaning how much an element wants to bond with other element. To summarise, chlorine and sodium are a direct example of an ionic bond that forms when two ions chemically attach together. The uses of chlorine in passing(a) life are vast and continue to be used world-wide specifically for maintaining a clean swimming pool environment and many uses as a cleaning agent.