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Free research papers and essays on topics related to: atomic number

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  • Aluminum - 1,420 words
    Aluminum Aluminum is one of a number of soft metals that scientists call poor metals. It can be shaped and twisted into any form. It can be rolled into thick plates for armored tanks or into thin foil for chewing gum wrappers. It may be drawn into a wire or made into cans. Aluminum is a generally popular metal because it does not rust and it resists wear from weather and chemicals. (Bowman, 391) Aluminum is an element. Its atomic number is thirteen and its atomic weight is usually twenty-seven. Pure aluminum melts at 660.2C and boils at 2500C. Its density is 2.7 grams per cube centimeter. Aluminum is never found uncombined in nature. (Bowman, 391) Aluminum is a very useful metal that is ligh ...
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  • Arsenic - 401 words
    Arsenic Element Arsenic may appear to be a poisonous element. This is because it is used as a poison for murder both in real life cases and in made up books. But there are a lot of chemical uses for arsenic such as it being a specimen. Arsenic is also known arsenic in French, Arsen in German, arsenico in Italian and arsenico in Spanish. The atomic number of the element arsenic is 33. The atomic weight is 74.92160(2). Its symbol on the periodic table is As and its electronic configuration is [Ar].3d10.4s2.4p3. Arsenic occurs in two solid modifications: yellow, and gray or metallic. Its color is tin- white which tarnishes to dark gray or black. Its luster is metallic but the tarnish will dull ...
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  • Atomic Theory - 703 words
    Atomic Theory Chemistry: A Brief History of Atomic Theory February 28, 1999 In the beginning of the 1800s John Dalton, an English scientist did work some work on gases, which lead him to the creation of a complex system of symbols for all known elements at the time. He took all the information he had collected, along with the Laws of Conservation of Mass, Definite Composition and Multiple Proportions and updated Aristotle's theory of matter with the Atomic Theory of Matter, which stated: - All matter is composed of tiny, indivisible particles called atoms. - Atoms of an element have identical properties. - Atoms of different elements have different properties. - Atoms of two or more elements ...
    Related: atomic, atomic number, mathematical theory, quantum theory, visible spectrum
  • Chemical Compounds Bromine - 290 words
    Chemical Compounds Bromine The element Bromine, is a red liquid which is explosive at room temperature and has a red brown vapour. It has an atomic number of 35 and an atomic mass of 79.909. The melting point of Bromine is -7 deg.C and the boiling point is 58 degC with a relative density of 3.1. Bromine is a volatile dense mobile, that is a reddish brown liquid, which quickly gives a brown toxic valour with a disagreeable irritating odour. It combines directly with most elements although heat or a reactant is often neccessary to start some reactions. Hydrobomic Acid and Hypobromous Acid is a mixture that is formed when Bromine reacts with water. Oxygen is liberated by Bromine when the result ...
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  • Chp 2 Atoms, Molecules And Bonds - 1,100 words
    CHP 2 ATOMS, MOLECULES AND BONDS Define element, atom, compound, molecule, and trace element. ELEMENT: a substance that cannot be broken down to other substances by chemical reactions. COMPOUND: a substance consisting of two or more elements combined in a fixed ratio. MOLECULE: two or more atoms held together by covalent bonds TRACE ELEMENTS: those required by an organism in only minute quantities. Give the mass, charge, and location of each sub-atomic particle. NEUTRON: Mass= 1 Dalton or 1.009 grams or 1.7 x 10-24 Charge= neutral Location=Center of the atom PROTON: Mass= 1 Dalton or 1.007 grams or 1.7 x 10-24 Charge= positive Location= Center of the atom ELECTRON: Mass= we ignore the mass o ...
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  • Dimitri Mendeleev - 639 words
    Dimitri Mendeleev Dimitri Mendeleev Derived by Dimitri Mendeleev, the periodic table may be one of the most informational tables contained in chemistry. By leaving gaps in the columns and rows, Mendeleev was allowing for the discovery of undiscovered elements of that time. From the properties of the elements surrounding these gaps, Mendeleev was able to predict the properties of these undiscovered elements. Finally, when other scientists discovered the tools of the periodic table, Mendeleev's achievements were recognized. Mendeleev was a versatile genius who was interested in many various fields of study, including pure and applied science. Dimitri Ivanovich Mendeleev. (1834-1907) , Dimitri ...
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  • Hydrogen - 638 words
    HYDROGEN Hydrogen, symbol H, is reactive, colorless, odorless, and tasteless gaseous element. The atomic number of hydrogen is 1. The element is usually classed in group 1 of the periodic table. Hydrogen was confused with other gases until the a British chemist demonstrated in 1766 that it was evolved by the action of sulfuric acid on metals and also showed at a later date that it was an independent substance that combined with oxygen to form water. The British chemist Joseph Priestley named the gas "inflammable air" in 1781, and the French chemist Antoine Laurent Lavoisier renamed it hydrogen. Like most gaseous elements, hydrogen is diatomic, but it becomes and turns into free atoms at high ...
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  • Living Thing Biology - 2,286 words
    Living Thing Biology Living things make up the world as we know it. Living things are involved in our life constantly, seeing that we are alive. There are five characteristics that are common to all living things. Living things are made up of one or more cells. Each cell is made up of living matter and is separated by a barrier that encloses the cell from its surroundings. However, there are many different kinds of cells that make up living things. A single cell can be one organism. These organisms are known as unicellular. Most of the organisms that we know best such as people, trees, and dogs are all made up of more than one cell. Organisms made of more than one cell are said to be multice ...
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  • Manganese - 243 words
    Manganese Hi, I am Manganese. I am an element discovered in 1774 by the Swedish chemist Johan Gottlieb Gahn. My symbol was devised, coincidentally, by taking the first and third letters in the word manganese. My atomic number is 25, my atomic mass is 54.938, and my density is 7.2. I melt at 1245 C and then in turn I boil at 1962 C. A fact about my ionization energy currently escapes me, but I do have some uses and interesting facts in the rest of the paper. I am used as an antioxidant nutrient, I activate important enzymes that are needed in digestion, and I am the 12th most abundant element in the earths crust. And now I will switch into a third person perspective because I am bored of talk ...
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  • Mercury - 514 words
    Mercury Mercury Atomic Number: 80 Latin: hydrargyrum liquid silver Atomic Symbol: Hg Atomic Weight: 200.59 Mercury is the only common metal that is a free-flowing liquid at room temperature. It is slightly volatile in room temperature and becomes solid when subjected to a pressure of 7640 atmospheres. The metal dissolves in nitric or concentrated sulfuric acid. The chief ore is cinnabar; Spain and Italy produce about 50% of the worlds supply of the metal. The commercial unit for handling mercury is the flask, which weighs about 76 pounds. The metal is obtained by heating cinnabar in a current of air and by condensing the vapor. The metal is widely used in laboratory work for making thermomet ...
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  • Mercury - 445 words
    Mercury Mercurys symbol is Hg, its atomic number is 80, its atomic mass is 200.59, its in group 12 and in period 6, and it also has two valence electrons. Its standard state is liquid at 298K and it is the heaviest known elemental liquid. It has a silvery white color. It is named after the planet Mercury the origin of the symbol Hg is the Latin word hydrargyrum meaning liquid silver. Mercury was known to ancient Chinese and Hindus before 2000 B.C. and was found in tubes in Egyptian tombs dated from 1500 B.C. Mercury is the only metal liquid at ordinary temperatures. Mercury is sometimes called quicksilver. It sometimes occurs free in nature and is found mainly in cinnabar ore, which is HgS. ...
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  • Nitrogen - 590 words
    Nitrogen Nitrogen, symbol N, gaseous element that makes up the largest portion of the earth's atmosphere. The atomic number of nitrogen is 7. Nitrogen is in group 15 (or Va) of the periodic table. Nitrogen was discovered by the British physician Daniel Rutherford in 1772 and recognized as an elemental gas by the French chemist, Antoine Laurent Lavoiser about 1776. Nitrogen is a colorless, odorless tasteless, nontoxic gas. It can be condensed into a colorless liquid, which can be compressed into a colorless, crystalline solid. Nitrogen exists in two natural forms, and four radioactive forms (artificial). Nitrogen melts at -210.01 degrees C, (-349.02 F), boils at -195.79 C (320.42 F), and has ...
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  • Nucleosynthesis - 1,314 words
    Nucleosynthesis The big bang which created the universe, only created the elements Hydrogen (H) and Helium (He) and possibly a very small amount of Lithium (Li). However, a glance at the periodic table of the elements shows that today (some 15 billion years after the big bang) there are at least 108 known elements. Every atom of every element heavier than Li has been produced since the big bang! The factories which make these elements are stars. Nucleosynthesis or the synthesis of nuclei, is the process by which stars (which start out consisting mostly of H and He) produce all other elements. The key is nuclear fusion, in which small nuclei are joined together to form a larger nucleus. (This ...
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  • Oxygen - 1,067 words
    ... bon dioxide from the blood into the lungs and the breathing out of air), constitutes only one phase of respiration. A second phase of it is the transportation of oxygen by the blood from the lungs to the tissues and of carbon dioxide from the tissues to the lungs. A third phase is the absorption (passage by diffusion) of oxygen into the tissue cells and tissue use of oxygen (the oxidative and other respiratory processes with in the tissues cells whereby energy is liberated). External respiration involves the exchange of gases between the circulation blood and the air. For this exchange to take place, a person needs a large moist surface where air and blood can come in close contact. The ...
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  • Phosphorus - 1,137 words
    Phosphorus The element that is featured in this report is phosphorus. Phosphorus is a chemical element that human beings, animals, and plants need for normal growth. The main use of phosphorus is fertilizer. It was difficult to find a lot of different information on this element. Description Phosphorus is a nonmetallic chemical element that can exist in several different forms. The chemical symbol for phosphorus is P, its atomic number is 15, and its atomic weight is 30.975. Phosphorus was first prepared by the German alchemist Hennig Brandt in 1669; in the course of his search for the philosophers stone he obtained from a residue of evaporated urine a white solid that glowed in the dark and ...
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  • Place In Periodic Table - 1,300 words
    Place In Periodic Table Phosphorus (P), arsenic (As), antimony (Sb), and bismuth (Bi) form a group of four elements in Group 5A of the periodic table. They exhibit increasing metallic properties going down the group. Nitrogen (N), which heads the group, is a colorless, odorless, and tasteless gas. Phosphorus is a highly reactive nonmetal, arsenic and antimony are poisonous metalloids, and bismuth is a true metal. Because of the arrangement of the outer electrons in their atoms, each of these elements can form up to five chemical bonds with other elements or groups of elements. Arsenic has an atomic number 33, atomic mass is 74.9216, and it sublimes (passes directly into a vapor without melti ...
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  • Platinum - 866 words
    Platinum I am a silvery metal that is as resistant to corrosion and tarnishing as gold. I am almost as rare and consequently am the likewise highly valued and used in Jewelry. I am also used in chemicals industry as a catalyst, in medicine as an anti-cancer drug, and in catalytic converters for car exhausts. I have an atomic number ok 78, my atomic weight is 195.09 (when rounded 195) and a symbol of Pt. Who am I? Im platinum of coarse! Platinum is a member of the six transition elements in Group VIII of the periodic table known collectively as the platinum metals (ruthenium, rhodium, palladium, osmium, iridium, and platinum). The name is derived from the Spanish platina, meaning, silver. The ...
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  • Platinum - 475 words
    Platinum subject = Chemistry title = Platinum Platinum is a relatively rare, chemically inert, metallic element. It symbol is Pt, atomic number is 78, and its atomic weight is 195.09. Platinum is one of the heaviest substances known. One cubic foot of Platinum weighs 21 times as much as a cubic foot of water. A grayish-white metal, Platinum has a melting point of 1772 degrees C and a realatively high boiling point of 3827 degrees C. It has a high fusing point, is ductile and malleable, expands slightly upon heating, and has high electrical resistance. Platinum is seldom used in its pure stage because it is too soft. The third most ductile metal, it can be drawn into a thread one twenty thous ...
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  • Potassium - 646 words
    Potassium potassium puh-tas'-ee-uhm The chemical element potassium is a soft, light, silver white metal. It is a member of the alkali metals, a group (IA of the periodic table) with similar physical and chemical properties. Its chemical symbol is K (from kalium, the Latinized version of the Arabic word for alkali). Its atomic number is 19, and its atomic weight is 39.098. Potassium was first made from potash, or potassium carbonate (K(2)CO(3)), which had important industrial uses in glass manufacture well before 1700. (It was often mistaken for sodium carbonate, or soda. Only their different sources prevented total confusion, potash being originally derived from the ashes of vegetable materi ...
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  • Radon - 569 words
    Radon Radon is an element that is on the periodic table of elements. It is a member of the family called the noble gases, which is group number 18. Radon is a gas. It is a gas at 298 k. it is the heaviest known mononuclear gas at that temperature. Radon is also colorless. When it is cooled below the freezing point, radon exhibits a brilliant phosphorescence, which becomes yellow as the temperature is lowered. At the temperature of liquid air it is sort of an orangish-red. The noble gases can be found on the very right side of the periodic table of elements. Radon has been around for quite some time. Radon comes from the element radium, which is derived from the element uranium. After radium ...
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