The symbol of technetium is Tc and the name of the element originates from the Greek word technetos which means artificial. It’s atomic number is 43 and it has 43 protons and electrons. The element has a total of 55 neutrons and has an atomic mass of 98 u. Technetium is in period 5 and group 7 of the periodic table. It has a melting point of 3,915 degrees Fahrenheit while it’s boiling point is about 4,000 degrees higher at 7,709 degrees Fahrenheit. Technetium is classified as a transition metal and has a density of 11g cm^-3. The element is a solid, but can also be used in other forms, as technetium 99 is used in its liquid form. The element usually has silvery-grayish metallic color. The Technetium element was the first to be synthetically …show more content…
Before this project I had never even heard of this element and I must’ve overlooked it dozens of times on the periodic table. Now I know so much about this element and I’m sure the information I gained from researching technetium will assist me in my future classes, quizzes, and tests. The first thing I learned about this element that fascinated me was that it is synthetically made, meaning it is a man-made element and doesn’t occur naturally on earth. However, just because it isn’t found on earth, doesn’t mean it can’t be found somewhere in our universes. During the course of my research I discovered that a small amount of technetium is found in the stars and this to me was quite astonishing. Another amazing fact that I learned from researching this element is that although it is highly toxic due to it’s high level of radioactivity, it can be used as a medical diagnostics to identify problems occurring in the organs in the human body. This amazed me because scientists must have had to find a way to control the element so that it wouldn’t harm the human body with is toxic radiation, and the fact that they did shows that even elements can be manipulated. I also found it fascinating that even before the element technetium was discovered, it was predicted by …show more content…
He was able to make this prediction because he noticed that there was a missing element (43) in the transition metals. This got me wondering, are there any other elements on the periodic table that could be missing? Could a regular person like me also predict the existence of an element that is not currently on the periodic table? Regardless to whether the answer is yes or no, when I am able to ask myself such curious questions, it makes me take interest in possibly becoming a chemist in the future, which is exciting. I could go on and on about the many things I learned about this element, but I will close my conclusion with one last fact that I found to be so awesome. I earlier mentioned that technetium can be used as a medical diagnostic and injected into the human body, specifically technetium 99. However, for medical uses, medics don’t just use the original form of technetium 99 because it breaks down while being transported due to its short half life and when broken down it can no longer serve its purpose in medicine. The solution for this problem is using molybdenum 99 instead because when it begins to break apart, this element becomes technetium 99 and it also has a longer half life, preserving the element for a longer period of
Although some of the elements have been known for thousands of years, our understanding of many elements is still young. Mendeleev’s first Periodic Table contained only 63 elements, and about that many were discovered in the following 100 years. Just like countries, emperors, philosophers, and cities, elements have histories, too.“The Disappearing spoon” by Sam Kean, is a detailed history of the elements on the Periodic Table. Kean does a important job of telling every single element’s journey throughout the history of mankind: from the earliest times, when chemistry was intermingled with alchemy, to these days of modern chemistry. For example: Thallium is considered the deadliest element, pretending to be potassium to gain entry into our cells where it then breaks amino acid bonds within proteins. The CIA once developed a plan to poison Fidel Castro by dosing his socks with thallium-tainted
Miodownik describes in detail how natural elements were manipulated by man to create man-made materials at the same minuscule scale that take place naturally. Materials science has provided the knowledge required for
Just as the title of the chapter suggests, the main focus of Chapter 11 is how elements found on the Periodic Table are not always what they appear. Kean begins this chapter with describing how elements can be unpredictable in some conditions, and uses example from the past to...
The best-selling novel, The Disappearing Spoon, is written by Sam Kean. The book revolves around the periodic table. It goes into such depth of the table, it is literally an adventure historically, politically, and scientifically. Not to mention, it is relevant to what has been learned this school year, which is what I’ll be talking about in this paper. The book is extremely helpful in learning the periodic table of elements, which is an imperative tool to have when studying physical science or chemistry, for example. It fills an unknown void of what the table is, solving mysteries as the chapter progresses.
Strontium was discovered by Adair Crawford, an Irish chemist, in 1790 while studying the mineral witherite (BaCO3). When he mixed witherite with hydrochloric acid (HCl), he did not get the results he expected. He assumed that his sample of witherite was contaminated with an unknown mineral, a mineral he named strontianite (SrCO3). Strontium was first isolated by Sir Humphry Davy, an English chemist, in 1808 through the electrolysis of a mixture of strontium chloride (SrCl2) and mercuric oxide (HgO). Strontium reacts vigorously with water and quickly tarnishes in air, so it must be stored out of contact with air and water. Due to its extreme reactivity to air, this element always naturally occurs combined with other elements and compounds. Strontium is very
achieved by Rutherford, has led to the creation of elements not found in nature; in work
Beryllium has the symbol Be. In the older chemical literature, beryllium is called glucinium after the Greek word glykys meaning sweet, because of Vauquelin's initial description and observation of Beryllium. Beryllium's atomic number is 4, its atomic weight is 9.01 and in its pure metal form it melts at 1278 degrees Celsius.
This element when becoming an isotope can become radioactive due to its high activity as a metal. In its natural state it is a soft metal and it has a shiny “ wax “ like silver/white color to it, it is so soft that a knife could cut through it without a problem.
We all know the saying, “Don’t judge a book by it’s cover.” Similarly, every element in the periodic table has its’ own story and its’ own unique meaning. However, the average high schooler simply associates these elements as something used in their chemistry classes. In fact, the elements seen on the periodic table actually have much more to do in our daily lives and in history than most people know. While giving a whole new perspective to the meaning of Chemistry, author Sam Kean successfully recounts the hidden tales through humor and wit in his bestselling novel The Disappearing Spoon: And Other True Tales of Madness, Love, and the History of the World from the Periodic Table of Elements. Specifically, Chapter 15, “An Element of Madness,” addresses the lives of several “mad scientists” associated with selenium, manganese, palladium, barium, and roentgenium that ultimately led to their downfall.
The symbol “As” from the periodic table, belongs to the chemical element Arsenic. Its located in group 15, period 4, and is clasificat as semi-metals. Arsenic’s atomic number is 33, and has a density of 5.776 grams per cubic centimeter. Arsenic melting point is 1090 K (817°C or 1503°F) and the boiling point is 887 K (614°C or 1137°F). The element specific gravities are 1.97 and 5.73, they are respectively to his two solid modifications: yellow, and grey (or metallic). Arsenic’s appearance is steel grey, very brittle, crystalline, and is classified as a semi-metal since it has properties of both.
The origin of the name "nickel" is a derivative from the German word "kupfernickel", meaning "Devil's Copper" or "St. Nicholas's Copper".The chemical properties of nickel are as follows: Nickel has the atomic number of twenty-eight. The atomic symbol of nickel, "Ni". It has the atomic weight (mass) of 58.70, to be exact, 58.693. It occurs in five stable isotopes. Physically, nickel is a lustrous silvery-white and takes on a hard polish.
Technetium-99m was used in an imaging demonstration in 1964. As a result of its favorable physical and chemical properties, it quickly became one of the most used radioisotopes for nuclear medical procedures (Keevil). This radioisotope can be found in nuclear medicine procedures that involve diagnostics of the heart, kidneys, lungs, liver, spleen, bones, and blood flow (GE Hitachi Nuclear Energy).
Then both Meyer and Mendeleyev built periodic tables alone, Meyer more impressed by the periodicity of physical properties, while Mendeleyev was more interested in the chemical properties. Then Mendeleyev had published his periodic table and his law in 1869 and forecasted the properties of the missing elements, and chemists then began to be grateful for it when the discovery of elements was predicted by the table that had taken place. Although, periodic tables have always been related to the way scientists thought about the shape and structure of the atom, and has changed over the years exactly for that reason.
The Periodic Table of Elements is commonly used today when studying elements. This table’s history begins in ancient times when Greek scientists first started discovering different elements. Over the years, many different forms of the periodic table have been made which set the basis for the modern table we use today. This table includes over 100 elements and are arranged by groups and periods. Groups being vertical columns and periods being horizontal columns. With all of the research conducted over the years and the organization of this table, it is easy to use when needed.
Dalton was the first person to develop a scientific atom theory, the ancient Greeks had ideas about the atom but could not prove it scientifically. Antoine Lavoisier and Dalton are responsible for the discovery of 90 natural elements. Dalton also explained the variations of water vapor in the atmosphere, the basis of meteorology. Dalton’s atomic theory says that each element contains its own number of atoms. Each element has its own size and weight.