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Free research papers and essays on topics related to: periodic table

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  • Periodic Table - 348 words
    Periodic Table Periodic Table First noticed by Greek people in about 400BC. They used the words "element", and "atom" to describe the differences and smallest parts of matter. Those ideas lasted for 2000 years. Elements were Earth, Fire, Air, and Water that explained "world stuff" easily came and went. In the 1600's Boyle, an experimenter, influenced by Democritus, Gassendi, and Descartes lent important weight to the atomic theory of matter. In the 1700's Lavoisier divided the elements into four classes. John Dalton suggested that the mass of an atom is the important property. "The chemical elements are composed of... indivisible particles of matter, called atoms... atoms of the same element ...
    Related: periodic, periodic table, john dalton, serial number, descartes
  • 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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  • Arsenic - 1,749 words
    Arsenic Element 33: Arsenic Abstract Arsenic is element 33 on the periodic table and is in Group 15. Arsenic is obviously an extremely poisonous element; however, some people have found arsenic to have a restorative effect on them. Chemically, arsenic is a metalloid. Two common forms of arsenic are gray and yellow. (see Figure 1-A) Element 33 has an atomic weight of 74.9216 and the chemical symbol of As. It boils at 613C, melts at 817C, and has a density of 5.72. (see Figure 2-A) The element has been known for centuries and can be easily obtained from ores such as arsenopyrite (FeAsS), realgar (As2S2), orpiment (As2S3), and arsenic trioxide (As2O3). There are many uses for arsenic. Among the ...
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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
  • 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 ...
    Related: mendeleev, photoelectric effect, periodic table, applied science, oxidation
  • How A Star Is Born - 1,174 words
    How A Star Is Born Birth of Stars Since my entire thesis for this paper is about how a star is born, I guess the first thing I should start out with is by telling you exactly what a star is. Stars are self-luminous gaseous spheres. They shine by generating their own energy and radiating it off into space. The stars' fuel for energy generation is the stuff they are made of -- hydrogen, helium, carbon, etc. -- which they burn by converting these elements into heavier elements. Nuclear fusion occurs, which is when the nuclei of atoms fuse into nuclei of heavier atoms. The energy given off by a star through nuclear burning heats its interior to many millions and, even in some cases to Pleiades S ...
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  • How Chemistry Affects My Daily Life - 705 words
    How Chemistry affects my Daily Life I get up in the morning and I breath in oxygen and I breath out carbon dioxide. I get in the shower and use water *. I use soap in the shower also. I dry the water off with air molecules. I dry my hair by using a hair dryer, which uses electricity. Electrical affects are caused by the position and the movement of positively and negatively charged particles.I use cologne which has alcohol in it. I wash my clothes using water and soap. I light a candle. This is an example of combustion. For this to occur there must be a presence of combustible substance, a temperature high enough to cause combustion, and the presence of oxygen or chlorine. Of course when I l ...
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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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  • John Dalton Was Born In September 5,1766 In Eaglesfield In Cumberland, England Dalton And His Family Lived In A Small Country - 1,479 words
    John Dalton was born in September 5,1766 in Eaglesfield in Cumberland, England. Dalton and his family lived in a small country house. His family had been Quakers since 1690. Quakers where members of a society of friends. John had a brother named Mary and A brother named Charles, when he was born his brother was twelve years old and his sister was two years old. Dalton's birth was not recorded, so when he grew up older he asked one of his relatives and got and answer which was his birthday. His parents were honest people and good workers. His dad Joseph had land he had inherited were Dalton and his brother Charles help out with the crop. His mother Deborah Greenup homespun textile Dalton's si ...
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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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  • Mendeleev Was Born In Tobolsk, Siberia He Was The Youngest Child Of A Large Family His Father Was A Local School Teacher Whos - 418 words
    Mendeleev was born in Tobolsk, Siberia. He was the youngest child of a large family . his father was a local school teacher whose career was ended by blindness and o support his family his mother ran a glass factory. Mendeleev learned some science from a political refugee who married one of his sisters. His father died in 1847, and soon after his mothers factory was destroyed by fire. She left Tobolsk with Mendeleev, she was determined that her last son should receive a good education. He studied chemistry at the University of Saint Petersburg, and in 1859 he was sent to study at the University of Heidelberg. There he met the Italian chemist Stanislao Cannizzaro, whose views on atomic weight ...
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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 ...
    Related: atomic number, protons and neutrons, periodic table, strike, fuel
  • Nucleosynthesis - 1,282 words
    ... rtant parameter regarding an unstable nucleus is its half-life. This is the time during which the nucleus has a 50/50 chance of decaying. Another way of thinking of this is that if we have a large collection of a certain unstable atom, after a length of time equal to one half-life, half of these atoms will have decayed. For some of the unstable isotopes along the s-process path, the half-life is sufficiently long that some will absorb another neutron before they decay, the rest will simply decay. The s-process path is said to branch at these isotopes (see fig. 2). Thus we see that in the s-process, neutron absorptions and beta decays cause an 56Fe nucleus to 'march up the chart of the nu ...
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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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  • 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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  • Rocks And Minerals - 1,802 words
    Rocks And Minerals According to Websters Dictionary, the definition of a mineral is an inorganic substance. Citrine is one of the most popular minerals. It is a variety of quartz. Citrine is a yellowish-orange mineral. Citrine is a very popular gemstone because it is very affordable and very pretty. Along with topaz, citrine is the birthstone for the month of November and the anniversary gemstone for the 17th year of marriage ( Citrine is also considered a symbol of hope, youth, health, and fidelity ( In ancient times, citrine was carried as a protection against snake venom and evil thoughts ( Other names for citrine are Imperial To ...
    Related: igneous rocks, metamorphic rocks, minerals, sedimentary rocks, periodic table
  • Silicon Microchips - 1,443 words
    Silicon Microchips Silicon is the raw material most often used in integrated circuit (IC) fabrication. It is the second most abundant substance on the earth. It is extracted from rocks and common beach sand and put through an exhaustive purification process. In this form, silicon is the purist industrial substance that man produces, with impurities comprising less than one part in a billion. That is the equivalent of one tennis ball in a string of golf balls stretching from the earth to the moon. Semiconductors are usually materials which have energy-band gaps smaller than 2eV. An important property of semiconductors is the ability to change their resistivity over several orders of magnitude ...
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