Biography of Dmitri Mendeleev, Periodic Table Inventor

Biography of Dmitri Mendeleev, Periodic Table Inventor Dmitri Mendeleev  (February 8, 1834–February 2, 1907) was a Russian scientist best known for devising the modern periodic table of elements. Mendeleev also made major contributions to other areas of chemistry, metrology (the study of measurements), agriculture, and industry. Fast Facts: Dmitri Mendeleev Known For: Creating the Periodic Law and Periodic Table of the ElementsBorn: February 8, 1834 in Verkhnie Aremzyani,  Tobolsk Governorate,  Russian EmpireParents: Ivan Pavlovich Mendeleev, Maria Dmitrievna KornilievaDied: February 2, 1907 in Saint Petersburg, Russian EmpireEducation: Saint Petersburg UniversityPublished Works:  Principles of ChemistryAwards and Honors:  Davy Medal, ForMemRS  Spouse(s): Feozva Nikitichna Leshcheva, Anna Ivanovna PopovaChildren: Lyubov, Vladimir, Olga, Anna, IvanNotable Quote: I saw in a dream a table where all elements fell into place as required. Awakening, I immediately wrote it down on a piece of paper, only in one place did a correction later seem necessary. Early Life Mendeleev was born on February 8, 1834, in Tobolsk, a town in Siberia, Russia. He was the youngest of a large Russian Orthodox Christian family. The exact size of the family is a matter of dispute, with sources putting the number of siblings between 11 and 17. His father was Ivan Pavlovich Mendeleev, a glass manufacturer, and his mother was Dmitrievna Kornilieva. In the same year that Dmitri was born, his father went blind. He died in 1847. His mother took on the management of the glass factory, but it burned down just a year later. To provide her son with an education, Dmitris mother brought him to St. Petersburg and enrolled him in the Main Pedagogical Institute. Soon after, Dmitris mother died. Education Dmitri graduated from the Institute in 1855 and then went on to earn a masters degree in education. He received a fellowship from the government to continue his studies and moved to the University of Heidelberg in Germany. There, he decided not to work with Bunsen and Erlenmeyer, two distinguished chemists, and instead set up his own laboratory at home. He attended the International Chemistry Congress and met many of Europes top chemists. In 1861, Dmitri went back to St. Petersburg to earn his P.hd. He then became a chemistry professor at the University of St. Petersburg. He continued to teach there until 1890. The  Periodic Table of the Elements Dmitri found it hard to find a good chemistry textbook for his classes, so he wrote his own. While writing his textbook, Principles of Chemistry, Mendeleev found that if you arrange the elements in order of increasing atomic mass, their chemical properties demonstrated definite trends.  He called this discovery the Periodic Law, and stated it in this way: When the elements are arranged in order of increasing atomic mass, certain sets of properties recur periodically. Drawing on his understanding of element characteristics, Mendeleev arranged the known elements in an eight-column grid. Each column represented a set of elements with similar qualities. He called the grid the periodic  table of the elements. He presented his grid and his periodic law to the Russian Chemical Society in 1869. The only real difference between his table and the one we use today is that Mendeleevs table ordered elements by increasing atomic weight, while the present table is ordered by increasing atomic number. Mendeleevs table had blank spaces where he predicted three unknown elements, which turned out to be germanium, gallium, and scandium. Based on the periodic properties of the elements, as shown in the table, Mendeleev predicted properties of eight elements in total, which had not even been discovered. Writing and Industry While Mendeleev is remembered for his work in chemistry and the formation of the Russian Chemical Society, he had many other interests. He wrote more than 400 books and articles on topics in popular science and technology. He wrote for ordinary people, and helped create a library of industrial knowledge. He worked for the Russian government and became the director of the Central Bureau of Weights and Measures. He became very interested in the study of measures and did a great deal of research on the subject. Later, he published a journal. In addition to his interests in chemistry and technology, Mendeleev was interested in helping to develop Russian agriculture and industry. He traveled around the world to learn about the petroleum industry and helped Russia to develop its oil wells. He also worked to develop the Russian coal industry. Marriage and Children Mendeleev was married twice. He wed Feozva Nikitchna Leshcheva in 1862, but the couple divorced after 19 years. He married Anna Ivanova Popova the year after the divorce, in 1882. He had a total of six children from these marriages. Death In 1907 at age 72, Mendeleev died from the flu. He was living in St. Petersburg at the time. His last words, spoken to his doctor, reportedly were, Doctor, you have science, I have faith. This may have been a quote from the famous French writer Jules Verne. Legacy Mendeleev, despite his achievements, never won a Nobel Prize in Chemistry. In fact, he was passed over for the honor twice. He was, however, awarded the prestigious Davy Medal (1882) and ForMemRS (1892). The Periodic Table did not gain acceptance among chemists until Mendeleevs predictions for new elements were shown to be correct. After gallium was discovered in 1879 and germanium in 1886, it was clear that the table was extremely accurate. By the time of Mendeleevs death, the Periodic Table of Elements was internationally recognized as one of the most important tools ever created for the study of chemistry. Sources Bensaude-Vincent, Bernadette. â€Å"Dmitri Mendeleev.†Ã‚  Encyclopà ¦dia Britannica, Inc., 25 Feb. 2019.Gordon. â€Å"Mendeleev - the Man and His Legacy...†Ã‚  Education in Chemistry, 1 Mar. 2007.Libretexts. â€Å"The Periodic Law.†Ã‚  Chemistry LibreTexts, Libretexts, 24 Apr. 2019.

The Ancient Illyrians Connection to Todays Albanians

The Ancient Illyrians Connection to Todays Albanians Mystery enshrouds the exact origins of todays Albanians. Most historians of the Balkans believe the Albanian people are in large part descendants of the ancient Illyrians, who, like other Balkan peoples, were subdivided into tribes and clans. The name Albania is derived from the name of an Illyrian tribe called the Arber, or Arbereshà «, and later Albanoi, that lived near Durrà «s. The Illyrians were Indo-European tribesmen who appeared in the western part of the Balkan Peninsula about 1000 B.C., a period coinciding with the end of the Bronze Age and beginning of the Iron Age. They inhabited much of the area for at least the next millennium. Archaeologists associate the Illyrians with the Hallstatt culture, an Iron Age people noted for production of iron and bronze swords with winged-shaped handles and for domestication of horses. The Illyrians occupied lands extending from the Danube, Sava, and Morava rivers to the Adriatic Sea and the Sar Mountains. At various times, groups of Il lyrians migrated over land and sea into Italy. The Illyrians carried on commerce and warfare with their neighbors. The ancient Macedonians probably had some Illyrian roots, but their ruling class adopted Greek cultural characteristics. The Illyrians also mingled with the Thracians, another ancient people with adjoining lands on the east. In the south and along the Adriatic Sea coast, the Illyrians were heavily influenced by the Greeks, who founded trading colonies there. The present-day city of Durrà «s evolved from a Greek colony known as Epidamnos, which was founded at the end of the seventh century B.C. Another famous Greek colony, Apollonia, arose between Durrà «s and the port city of Vlorà «. The Illyrians produced and traded cattle, horses, agricultural goods, and wares fashioned from locally mined copper and iron. Feuds and warfare were constant facts of life for the Illyrian tribes, and Illyrian pirates plagued shipping on the Adriatic Sea. Councils of elders chose the chieftains who headed each of the numerous Illyrian tribes. From time to time, local chieftains extended their rule over other tribes and formed short-lived kingdoms. During the fifth century B.C., a well-developed Illyrian population center existed as far north as the upper Sava River valley in what is now Slovenia. Illyrian friezes discovered near the present-day Slovenian city of Ljubljana depict ritual sacrifices, feasts, battles, sporting events, and other activities. The Illyrian kingdom of Bardhyllus became a formidable local power in the fourth century B.C. In 358 B.C., however, Macedonias Philip II, father of Alexander the Great, defeated the Illyrians and assumed control of their territory as far as Lake Ohrid (see fig. 5). Alexander himself routed the forces of the Illyrian chieftain Clitus in 335 B.C., and Illyrian tribal leaders and soldiers accompanied Alexander on his conquest of Persia. After Alexanders death in 323 B.C., independent Illyrian kingdoms again arose. In 312 B.C., King Glaucius expelled the Greeks from Durrà «s. By the end of the third century, an Illyrian kingdom based near what is now the Albanian city of Shkodà «r controlled parts of northern Albania, Montenegro, and Hercegovina. Under Queen Teuta, Illyrians attacked Roman merchant vessels plying the Adriatic Sea and gave Rome an excuse to invade the Balkans. In the Illyrian Wars of 229 and 219 B.C., Rome overran the Illyrian settlements in the Neretva River valley. The Romans made new gains in 168 B.C., and Roman forces captured Illyrias King Gentius at Shkodà «r, which they called Scodra, and brought him to Rome in 165 B.C. A century later, Julius Caesar and his rival Pompey fought their decisive battle near Durrà «s (Dyrrachium). Rome finally subjugated recalcitrant Illyrian tribes in the western Balkans [during the reign] of Emperor Tiberius in A.D. 9. The Romans divided the lands that make up present-day Albania among the provinces of Macedonia, Dalmatia, and Epirus. For about four centuries, Roman rule brought the Illyrian-populated lands economic and cultural advancement and ended most of the enervating clashes among local tribes. The Illyrian mountain clansmen retained local authority but pledged allegiance to the emperor and acknowledged the authority of his envoys. During a yearly holiday honoring the Caesars, the Illyrian mountaineers swore loyalty to the emperor and reaffirmed their political rights. A form of this tradition, known as the kuvend, has survived to the present day in northern Albania. The Romans established numerous military camps and colonies and completely latinized the coastal cities. They also oversaw the construction of aqueducts and roads, including the Via Egnatia, a famous military highway and trade route that led from Durrà «s through the Shkumbin River valley to Macedonia and Byzantium (later Constantinople) Constantinople Originally a Greek city, Byzantium, it was made the capital of the Byzantine Empire by Constantine the Great and was soon renamed Constantinople in his honor. The city was captured by the Turks in 1453 and became the capital of the Ottoman Empire. The Turks called the city Istanbul, but most of the non-Muslim world knew it as Constantinople until about 1930. Copper, asphalt, and silver were extracted from the mountains. The main exports were wine, cheese, oil, and fish from Lake Scutari and Lake Ohrid. Imports included tools, metalware, luxury goods, and other manufactured articles. Apollonia became a cultural center, and Julius Caesar himself sent his nephew, later the Emperor Augustus, to study there. Illyrians distinguished themselves as warriors in the Roman legions and made up a significant portion of the Praetorian Guard. Several of the Roman emperors were of Illyrian origin, including Diocletian (284-305), who saved the empire from disintegration by introducing institutional reforms, and Constantine the Great (324-37)who accepted Christianity and transferred the empires capital from Rome to Byzantium, which he called Constantinople. Emperor Justinian (527-65)who codified Roman law, built the most famous Byzantine church, the Hagia Sofia, and re-extended the empires control over lost territories- -was probably also an Illyrian. Christianity came to the Illyrian-populated lands in the first century A.D. Saint Paul wrote that he preached in the Roman province of Illyricum, and legend holds that he visited Durrà «s. When the Roman Empire was divided into eastern and western halves in A.D. 395, the lands that now make up Albania were administered by the Eastern Empire but were ecclesiastically dependent on Rome. In A.D. 732, however, a Byzantine emperor, Leo the Isaurian, subordinated the area to the patriarchate of Constantinople. For centuries thereafter, the Albanian lands became an arena for the ecclesiastical struggle between Rome and Constantinople. Most Albanians living in the mountainous north became Roman Catholic, while in the southern and central regions, the majority became Orthodox. Source [for the Library of Congress]: Based on information from R. Ernest Dupuy and Trevor N. Dupuy, The Encyclopedia of Military History, New York, 1970, 95; Herman Kinder and Werner Hilgemann, The Anchor Atlas of World History, 1, New York, 1974, 90, 94; and Encyclopaedia Britannica, 15, New York, 1975, 1092. Data as of April 1992SOURCE: The Library of Congress - ALBANIA - A Country Study

Compare and contrast the advantages and disadvantages of joining a Assignment

Compare and contrast the advantages and disadvantages of joining a professional association - Assignment Example rm, to voice and commiserate, and to provide affiliates a feeling that they are never alone in the hurdles opened by their profession in general (Kjellberg, 2013). Opportunities to discover new techniques, job options, among others, are priceless advantages to group members (Kjellberg, 2013). The disadvantages, on the other hand, of joining these organizations are needless fees, consumes a lot of time, needless expenses, socializing takes the attention away from career development and also they create a lot of pressure to achieve highly among its members (Harvey et al., 2003). Most professional organizations need the reimbursement of yearly fees. There might also be the first application fee (Kjellberg, 2013). Whereas $100 does not appear to be much, it accumulates when the individuals joins the national and state associations of numerous professional organizations (Harvey, 2004). Apart from the membership fees and applications, people also spend money on association lunches, breakfasts and dinners and gas expenses or transportation costs (Harvey, 2004). According to these advantages and disadvantages of belonging to a professional organization, I would opt to join a professional organization because I need access to the information, which will influence my practice. I also need people who will advocate for me in front of others and people who will develop me professionally, thus my decision to join a professional

Policy Contribution part 2 Assignment Example | Topics and Well Written Essays - 2000 words

Policy Contribution part 2 - Assignment Example This proposal favors the Latino portion of the population who make up the highest number of immigrants from Mexico, but the government should consider many underlying factors, including the reasons for immigration and the effects on the United States’ resources. This report will give an overview of factors to consider when formulating an immigration policy; then propose a possible policy change and implementation plan using the fifth and sixth steps Jansson’s policy plan respectively (Jansson, 2010). According to Guyette, Tavalin and Rooker (2012), the United States has throughout history attempted to control illegal immigration into the country by passing restrictive policies and increasing border security. These approaches have failed if the debate for and against illegal immigrants is anything to go by. Data concerning illegal immigration is mostly hypothetical, since transactions concerning immigrants are mostly not recorded in any official documents. For instance, Barnes (2010) claims that it costs each native households $ 1,117 per annum to support illegal immigrants, totaling to $113 billion a year for the whole nation. The influx of illegal immigration cases can be blamed on a myriad of reasons, but the main cause is the government’s inefficiency in enforcing its policies on immigration. Therefore, the country needs to refrain from a complete overhaul of policies, which has been the main reason for increased illegal immigration due to inefficiency and inconsistencies, and adopt a stable policy that will be monitored and improved continuously. Any policy proposal change should ensure to account for all the positive and negative aspects of immigration, mostly by being fair to illegal immigrants if the merits of having them in the country outweigh the demerits. An effective policy should contribute positively to various aspects of the United

Italian Cuisine and Pizza Essay Example for Free

Italian Cuisine and Pizza Essay Pizza is an oven-baked, flat, round bread typically topped with a tomato sauce, cheese and various toppings. Pizza was originally invented in Naples, Italy, and the dish has since become popular in many parts of the world.. Many varieties of pizza exist worldwide, along with several dish variants based upon pizza. Pizza`s in Pakistan The first pizzerias opened up in Karachi and Islamabad in the late 1980s, with Pappasallis serving pizza in Islamabad since 1990. Pizza has gained a measure of popularity in the eastern regions of Pakistan namely, the provinces of Sindh, Punjab, and Azad Kashmir, as well as the autonomous territory of Gilgit-Baltistan. Pizza has not penetrated into western Pakistan; of the remaining provinces and territories of Pakistan, only one (Khyber Pakhtunkhwa) has seen much of the dish, in the form of a single Pizza Hut in Peshawar. In the regions where pizza is known, spicy chicken and sausage-based pizzas are very popular, as they cater to the local palate. Health matters Advantages European nutrition research on the eating habits of people with cancer of the mouth, oesophagus, throat or colon showed those who ate pizza at least once a week had less chance of developing cancer. , An antioxidant chemical in tomatoes, which is thought to offer some protection against cancer. Carlo La Vecchia, a Milan-based epidemiologist said, Pizza could simply be indicative of a lifestyle and food habits, in other words the Italian version of a Mediterranean diet. A traditional Mediterranean diet is rich in olive oil, fiber, vegetables, fruit, flour, and freshly cooked food. Disadvantages In contrast to the traditional Italian pizza used in the research, popular pizza varieties in many parts of the world are often loaded with high fat cheeses and fatty meats, a high intake of which can contribute to obesity, itself a risk factor for cancer. Pizza can be high in salt, fat and calories. There are concerns about negative health effects. Food chains, such as Pizza Hut, have come under criticism for the high salt content of some of their meals, which were found to contain more than twice the daily recommended amount of salt for an adult. Some mass produced pizzas by food chains have been criticized as having an unhealthy balance of ingredients. Some studies have linked consumption of the antioxidant lycopene, which exists in tomato products that are often used on pizza, as having a beneficial health effect.

Essay --

Sigmund Freud, probably the most famous psychologist and most controversial of the twentieth century, has helped shaped how we consider our views of the world. His theories bring forth a new kind of thinking to the psychology world and show why we think them. It’s a way many don’t think but may put forth the reasoning to it. There are many though that think Freud was just another crazy psychologist that was on drugs. Though his many proofs behind his major theories such as: the conscious and unconscious mind, the Id, Ego, and Superego, psychosexual theory, and others as well, can prove why it wasn’t just a drug trip Freud was on. The mind is divided up into three sections according to Freud. It consists of the conscious, preconscious, and the unconscious mind. In Sigmund Freud's psychoanalytic theory of personality, the conscious mind consists of everything inside of our awareness. (Psychology) This part of the mind is known for keeping hold of our senses, memories and perception in our awareness. This part of our mind can tie into our preconscious mind as well, through the things we aren’t aware of though when thought about its presence is in our conscious mind now. The preconscious mind is the part of the mind that represents ordinary memory. (Psychology) We can remember this stuff and always pull it back into our conscious mind whenever needed. This makes much sense towards Freud’s thinking bringing forth a tie between the conscious mind and preconscious, showing how we can do things in our conscious mind and be stored in our preconscious for later use. The third part of our mind is the unconscious mind. The unconscious mind is a reservoir of feelings, thoughts, urges, and memories that outside of our conscious awareness. (P... ...st of a person's life and the individual develops a strong sexual interest in the opposite sex. (Psychology) This stage represents how an individual is most interested in one’s pleasure seeking thoughts such as relationships and or sexual thoughts. This can compromise how we humans think and how we react to many things. It all does seem like this information doesn’t make sense though it all seems to tie in to each other. All these theories tie into each other and have some proof behind each one. It all seems reasonable when too many and is always used as a reference in the psychology world. There are many critics towards Freud’s work due to the time period he was living in and how much it influenced his thinking. Others put forth how the drugs he was on may have caused to him to think all these theories though with the proof behind some of them it can go either way.

How does samules shape the ending to Act 1 and how effective do you find it? Essay

How does Samuels shape the ending to Act 1 and how effective do you find this ending? (30 marks) Samuels uses different ideas and techniques in order to shape the ending in order to make it an effective piece of writing. He creates suspense and emotion in order for the audience to feel attached to the plot and show the true feelings of the characters. Samuels does this by not only highlighting the vast emotions of both charters but also mixes this with a novel called ‘The Rat-catcher’. This book was one from Evelyn’s childhood and both she and Eva were haunted by it throughout her life. The first way in which Samuels shapes the ending of Act 1 is by exaggerating the drama and emotion of the situation in order to emphasis the great truth that is revealed in this situation; that Faith is a Jew, effected by the Holocaust. For example Faith says, â€Å"Jesus. How could I possibly not be a bad child with such a terrible mother?† Then later in the conversation, â€Å"I could kill you†. During this last section the truth is being revealed to Faith of her past, of her being a Jew and of her grandfather’s death during the holocaust which had been otherwise hidden from her previously. Here Samuels highlights the flying and rising emotions of the conversation, in order to spark a more interesting and viewable final act. Another way in which Samuels shapes the ending of Act 1 is by creating a link between Eva, Evelyn and the dreaded Rat-catcher, in an on stage masterpiece. He uses the layouts of the play to not only create drama between the same person, in different periods of time but also between them and a mythical being. For example, Evelyn: â€Å"He’s not coming† and Eva: â€Å"He’ll burn my fingers till they melt†. Here both characters are talking about someone who does not actually appear to them but is rather just a being that gets inside their consciences in order to question what they are doing. This means that a dramatic contrast is created between Eva and Evelyn, the past and present, which impacts by allowing the audience to understand the difficultly between the choose of leaving her old life behind of facing the reality of what is a daughter discovering her hidden past.