Fluorine

A shark tooth is one of numerous teeth in the shark’s mouth. Different sharks can be classified on the basis of the teeth they have and the functions that such teeth perform in consuming their prey. There are four basic types of shark teeth: dense flattened, needle-like, pointed lower with triangle upper, and non-functional. Sharks have a complete set of teeth when they are born. These teeth are modified placoid scales with an outer layer of enamel, dentine and a central pulp cavity; similar to…

5-CinthiaV-Selenium The name of my element is Selenium. The element symbol is “Se”. Selenium was discovered in Sweden by Jons Jacob Berzelius in 1817. Selenium is an origin for a greek word meaning moon. Selenium has four energy levels. In the first energy level, it has two electrons. The second energy level has eight electrons. The third energy level has 18 electrons. The fourth energy level has six valence electrons. Selenium has forty-five neutrons. Selenium has the…

Elements above the atomic number 95 are produced in a particle accelerator by accelerating a small charged nuclei (such as Helium, Boron or Carbon) in a particle accelerator to combine with a heavy nucleus (often of a previously made transuranic element) target. The transuranic elements have short half-lives as the atomic number increases. The smaller nuclei combines within the target nucleus, creating a new unstable nuclide or radioactive isotope. The high speeds are required to overcome the…

Fluoridation: Creating Better Smiles Everyday “Water Fluoridation has changed the smiles of Americans for 57 years” –Scott M. Presson, DDS, MPH, and Chief of the Program Services Branch in the division of Oral Health at the Center for Dieses Control and Prevention (Molony). Water fluoridation is defined as; “to add fluoride to drinking water to reduce tooth decay” (Fallon). Most communities have fluoridated drinking water. Almost all water contains some naturally occurring fluoride, but at…

Liquid ventilation (LV) is a form of mechanical ventilation in which the lungs are insufflated with an oxygen-rich liquid, such as perfluorocarbon, rather an oxygen-rich gas mixture (1). There are two primary types of liquid-assisted ventilation: total liquid ventilation and partial liquid ventilation. In total liquid ventilation, the lungs are filled with perfluorocarbon to a volume equivalent to the lung’s functional residual capacity and a liquid ventilator is used to generate tidal breathing…

To start off with this experiment, we drew dot structures for each compound and decided whether the compound was polar, nonpolar, or ionic. We found that KCl and CaCl*2H2O were ionic compounds, so we used the electrical conductivity tester to insure us that they indeed conducted electricity. After testing these two compounds, we decided that KCl was the solution labeled “Wolves” and CaCl*2H2O was the solution labeled “Swarm”. We decided this because we knew that the CaCl*2H2O compound was a…

conditions. At least 5 fold excess of water, half of the maximum theoretical yield of hydrogen cyanide gas will be created in at least 10 to 12 minutes. The component can violently react with some of the chemicals or gasses from the periodic table like fluorine and magnesium. Sodium cyanide actually has an odor which has a faint almond-like smell and it also…

If love lock was right, there were no chemical processes or sinks that could remove CFCs from the lower atmosphere. Rowland and Molin argued they would finally decompose under the impact of ultraviolet radiation, where it would be converted into fluorine and chlorine compounds (known to be ozone scavengers). The aerosol industry immediately responded to their work. In 1977, CFC propellant usage begun to drop by three-quarters because the public realized that there were many substitutes for CFCs,…

Xenon is one of the 6 noble gases on the periodic table belonging to group 18. The element was discovered by Sir Ramsay in 1898. Xenon’s symbol is Xe and its atomic number is 54. Xenon’s atomic mass is 131.293 grams. Its boiling point is -107 degrees Celsius, while its freezing point is -112 degrees Celsius. The density of Xenon at 20 degrees Celsius is 0.005887 grams per cubic centimeter. Xenon has 21 isotopes Xenon is described as being completely colorless and odorless, however when…

It is also most commonly known as, teflon. Poly-tetrafluoroethylene (PTFE) is grouped in the plastics called fluoropolymers. It is the polymerized form of tetrafluoroethylene. PTFE is a fluorocarbon solid consisting of only carbon and fluorine. Its molecular formula is (C2F4)n. It is hydrophobic, meaning that it rejects water. PTFE has one of the lowest coefficients of friction, is very slick, slippery and creep. Poly-tetrafluoroethylene is also chemically inert. PTFE has a melting point…