Uranium
Uranium was discovered in the 1700's in the coal mines of bohemia and
Jachlovikna. Uranium's atomic number is 92, its Symbol is U and the atomic mass of uranium is 238.0289. Miners called it Pechblende meaning, Pechblende, from the German words pech, which means either pitch or bad luck, and blende, meaning mineral Uranium's first full analysis was done on 1789 by Martin Klaproth, a self-taught well educated german chemist. Klaproth, having extracted from pitchblende what he called 'a strange kind of half metal' (he had only isolated its oxide), he resisted the temptation to give his own name to the new element, which was quite customary at the time. William Herschel gave uranium its name from the last planet founded in are solar system at the time, he named it Uran, which in its final form became uranium, a name which today is known worldwide while klaproth's own fame has faded. Uranium is as dense as gold. Uranium, was first prepared with some difficulty, in 1841 by the french chemist Eugène
Peligot, using thermal reaction of tetrachloride with potassium. Later in 1870, an important fact was established: uranium is the last and heaviest element present on earth. This was demonstrated by Dimitri Mendeleev in his famous perodical classification of the elements by chemical properties and increasing atomic mass. Experimentation with uranium lead to many discoversies such as the
X-ray by Wilhelm Röntgen, on November 8, 1895.
Wilhelm Röntgen, was awarded the first Nobel prize in 1901 for the development of the X-ray. Uranium is weakly radioactive, decaying slowly but inexorably at the rate of one milligram per tonne per year. It is transformed into inactive lead through a chain of radioelements or daughters, each of which has a characteristic disintegration rate, a constant of nature that man has never been able to alter. The proportion of each radioelement in the ore is inversely proportional to its rate of disintegration.
“All the soldiers there were wearing NBC (nuclear, biological, chemical warfare) protective clothing. We said: ‘What’s going on here?’ And their answer was: ‘Didn’t you know? This ammunition is a bit dodgy.’” – Tim Pubrick, Gulf War veteran, British Royal Army tank commander.6
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.
To date Uranus has been found to have 21 satellites four of which have yet to be named and 11 rings.
In today’s day and age many people around the world have become dependent on what seems like useless or needless things such as the internet and television. This is one of the negative effects of science and the technology that comes with it. Some of these technologies seem harmless, like cellphones and computers, but it seems as the years progress people want more and more power, literally and figuratively. The element uranium is a perfect example; this element has the power to do well in generating power for millions of people, and the power to do wrong in nuclear warfare.
Uranium is a rare element and formed not just on Earth but also in space and other planets. It is formed in exploding supernovas, and since it has 92 electrons and 92 protons it is the heaviest naturally produced element. It is radioactive and very harmful and sometimes fatal to humans when contact is made. However it is a sustainable and long lasting source of energy and much better for the environment compared to the more traditional approach to energy, Fossil Fuels. Some scientists say it may be the solution to climate change.
supplied by the uranium in sea water for 7 million years(Energy 25). This is a
An atom, by definition, is the smallest part of any substance. The atom has three main components that make it up: protons, neutrons, and electrons. The protons and neutrons are within the nucleus in the center of the atom. The electrons revolve around the nucleus in many orbitals. These orbitals consist of many different shapes, including circular, spiral, and many others. Protons are positively charged and electrons are negatively charged. Protons and electrons both have charge of equal magnitude (i.e. 1.602x10-19 coulombs). Neutrons have a neutral charge, and they, along with protons, are the majority of mass in an atom. Electron mass, though, is negligible. When an atom has a neutral charge, it is stable.
... name on the works, he had stolen or sent them to his friends.” Books he did not like or recognize, he had destroyed.
Uranium was discovered by Martin Heinrich Klaproth, a German chemist, in the mineral pitchblende (primarily a mix of uranium oxides) in 1789.Klaproth, as well as the rest of the scientific community, believed that the substance he extracted from pitchblende was pure uranium, it was actually uranium dioxide (UO2). After noticing that 'pure' uranium reacted oddly with uranium tetrachloride (UCl4), Radioactivity was first discovered in 1896 when Antoine Henri Becquerel, a French physicist, detected it from a sample of uranium. Today, uranium is obtained from uranium ores such as pitchblende, uraninite , carnotite and autunite as well as from phosphate rock , lignite (brown coal) and monazite sand . Since there is little demand for uranium metal, uranium is usually sold in the form of sodium diuranate , also known as yellow cake, or triuranium octoxide).
The difference between potassium and sodium was not discovered until the 18th century. "Vegetable alkali" also known as potassium carbonate came from the earth. "Mineral alkali" also known as sodium carbonate came from wood ashes. Early chemists did not recognise that these were two different chemical compounds.