Iliana Garcia
Mrs. Im
Chemistry Period 3
12 May 2014
The 15th Most Abundant Element
In 1790 a discovery was made by an Irish Chemist named Adair Crawford. This discovery was the thirty-eighth element on the periodic table, Strontium. Its name comes from the town Strontian, Scotland where it was discovered. Strontium is a metal and belongs to the alkaline earth metals. “The alkaline earth elements are metallic elements found in the second group of the periodic table. All alkaline earth elements have an oxidation number of +2, making them very reactive. Because of their reactivity, the alkaline metals are not found free in nature” (Bentor). Being in period number five, Strontium has an atomic number of thirty eight which represents the number of protons in the nucleus. There are approximately eight-seven point sixty-two protons and neutrons in the atom which gives Strontium its atomic mass. Another way that Strontium can be represented is through its symbol Sr.
All elements on the periodic table have chemical and physical properties. Some of Strontium’s physical properties include ...
The "2nd U.S. Circuit Court of Appeals" held that those business practices that have had a disparate impact effect on the older workers are now considered to be actionable under one national anti-discrimination law (Hamblett, 2004). The case does reaffirm a second Circuit precedent that had been set but which is at odds with what a majority of federal courts have held. The appeals court supported the idea that a layoff plan had been properly brought under the The Age Discrimination in Employment Act of 1967 (ADEA) although the company did not have the intention of discriminating.
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
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
The Beryllium element, an alkaline earth metal which belongs to group II of the periodic table, was first discovered in 1798 by L.M. Vauquelin. Vauquelin,a French chemist, was doing work with aluminum and noticed a white powder that was nothing like that of aluminum or any of its derivatives. Vauquelin named this mystery powder, gluinium because of its sweet taste was like that of glucose. In 1828, Wohler, a German metallurgist reduced it to its metallic form and renamed it beryllium.(figure 2)
Sulfur goes back to the ancient times but it was called brimstone. In 1979, a French chemist named Antoine Lavoisier recognized sulfur was an element and added it to his list of elements. The element sulfur is considered a nonmetal and is the 10th most abundant element in the universe. On the periodic table sulfur is in group sixteen and it is a representative element. Sulfur has an atomic mass of 32.07 with an atomic number of 16. There are three energy levels for sulfur the first energy level is two, the second energy level is eight, and the third energy level is six.
The earth is made up of roughly 111 elements and combinations thereof, but only around 90 of the elements occur naturally. In 1789 Martin Klaproth discovered a new element and decided to name it after the newly discovered planet Uranus (Zoellner, 2009). This element called uranium is lithophilic and is the last natural element on the periodic table. It is the 92nd elements, containing 92 protons and an atomic mass of 238.0 grams (Cox, 1995). Uranium comes from the ores of uranite, canotite, and is present in only low concentrations of igneous rocks, such as granite. Uranium can also be seen in some glazes of pottery, as well as in the metals of armor-piercing weapons. This element also contains an extremely long half-life of over four billion years. This means that a majority of the uranium on earth today, is the exact same uranium that was present in the makings of the Earth (Cox, 1995; Thomson, 1963).
Scandium is an element on the periodic table. It is a metal in group number 3 also known as a transition metal. Scandium has an atomic number of 21 and an atomic mass of 44.95. Sc is the chemical symbol for Scandium which has 21 protons, 21 electrons, 24 neutrons and 2 valence electrons. Scandium is a soft, silvery element which is very rare. It was discovered in 1879 by the Lars Fredrik Nilson. He detected this scandium in the minerals euxenite and gadolinite. He named the element scandium, from the Latin word Scandia meaning "Scandinavia". Scandinavia is now known as the countries of Sweden, Norway, and Denmark. The reason why Scandium was named after Scandinavia is because it is in the Scandinavian region where Scandium is most abundant.
Technetium was originally discovered by three german chemists, Ida Noddack-Tacke, Walter Noddack and Otto Berg, whom had published an article stating the discovery of “Masurium” in 1925, however at the given time because they were unable to verify the existence of “Masurium,” the International Union of Pure and Applied Chemistry excluded their discovery. It was believed that Masurium was presumably Technetium due to the chemical properties and atomic number being very similar. Technetium was later discovered and proved in the form of Technetium-97 by two assistant researches of University of California in Berkeley, Emilio Segre and Carlo Perrier. In 1937 the discovery originated from a sample of mol...
One of the least spoken about elements, cerium, is important and rather abundant for being considered a rare metal. It is more abundant than most metals in Earth’s crust. Cerium (Ce) has an atomic number of 58 and an average atomic mass of 140.116. To find it on the Periodic Table, either find atomic number 58 or use the electron configuration of [Xe]6s24f15d1. When searching across The Periodic Table, cerium is not a definitive eye catcher, however, seeing pure cerium ignite when scratched will spark interest in most people. Usually, cerium is in a solid metal form as an conductor. cerium was named after an asteroid called Ceres. All in all, cerium is a usually silvery, sometimes dark gray, malleable metal, in the Lanthanide series in period six that is very reactive but has many uses.
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.
Radioactivity Experiments Aim: To determine the penetrating power and the range in air of the three radioactive emissions alpha, beta and gamma. Apparatus: * gm tube, * clamp stand, * the counter thing, * ruler, * set-square Method of penetrating power of Alpha particles, Beta particles & Gamma Rays: The equipment was set up as shown below to measure the penetrating power of each radioactive source. Geiger-Muller Tube Again the measurements were taken without the absorber to measure background radiation.
Tritium is a hazardous substance that should only be used by professionals or with professional supervision. However, Tritium undergoes beta decay, which is not as powerful and disables the beta particles from penetrating the skin. It is still not correct to perform experiments without being fully protected. There are still many health risks that are associated with Tritium. Exhaling, drinking and eating substance containing tritium is highly risky for your body. Once tritium has been injected or ingested into the human body, the half-life of the tritium is minimized to 7-14 days which also minimizes the power of the tritium, but still dangerous. A research which took place in Karnataka, India, shows that the half-life is partially based on
Radium is the 88th element on the periodic table, that gave off high levels of radioactivity, and for the first twenty years it was a magical healing substance that glowed in the dark. Introducing, this element to the human populace began both innovations to health science and tragic deaths of many who believed it was harmless.
Scientists have discovered a new organ now called the interstitium, (An interstitial space within a tissue or organ, specifically the tissue between the pulmonary alveoli and the bloodstream. It is a series of connected, fluid-filled spaces found under skin as well as throughout the gut, lungs, blood vessels and muscles) it plays a critical role in how many tissues and other organs do their jobs.
Nuclear Fusion - When two light atoms bond together, to create a heavier one. The total mass of the new atom is less than that of the two that formed it, the "missing" mass is given off as energy, as described by Albert Einstein's famous E=mc2. (HyperPhysics.Phy, 2017).