understand mole concept & Avogadro’s concept To determine the empirical & molecular formulae Atomic Composition 3 subatomic particles made up all atoms: Electrically positive protons Electrically neutral neutrons Electrically negative electrons Structure of An Atom Table: Properties & Location of Protons‚ Neutrons & Electrons In Atom Subatomic Symbol Relative Mass Mass Location Particle electrical (g) (amu) charge Proton p+ +1 1.6726 1 In the x 10-24 nucleus Electron e-1 9.1094 0.0005 Outside x
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regional metamorphism which affects sediments and interbedd. CATASTROPHISM: the theory that changes in the earth’s crust during geological history have resulted chiefly from sudden violent and unusual events. CEMENTATION: the binding together of particles or other things by cement CHALK: a soft white limestone (calcium carbonate) formed from the skeletal remains of sea creatures. CHEMICAL WEATHERING: the erosion or disintegration of rocks‚ building materials‚ etc.‚ caused by chemical reactions
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solids‚ metal alloys‚ crystals‚ and other solid solutions. The tendency for atoms to bond and break apart is responsible for most of the physical changes we observe in nature‚ and this is studied by the science of chemistry. Atoms and sub-atomic particles behave in peculiar ways that cannot be explained through the classical laws of physics. The field of quantum mechanics was developed to explain the structure and behavior of
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The History of the Atom The History of the Atom Democritus first proposed an atomic model. He said that all matter could be divided into smaller and smaller pieces until a single indivisible particle was reached. He called this particle an atom after the Greek word ‘atomos’ meaning not cuttable. He believed that different atoms are of different sizes‚ have regular geometric shapes and are always in motion. He also said that there is empty space between atoms. Aristotle severely criticized Democritus’
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as subatomic particles and availability in nature as well as information on the element’s isotopes. First of all‚ the element was not recognized to be different than iron until the 1600’s. Miners in Germany were trying to extract copper from ore‚ but were unsuccessful at any rate. They narrowed their problem down to a dark red ore‚ often with a green coating. This was the first accurate physical description given to the element. The miners gave the new irritating ore the name
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Alice in Quantumland 1. Electrons have no distinguishing features except spin Upon falling into the quantum wonderland while in her living room‚ Alice finds herself faced with a new reality of existence that seems to baffle her. She is first met with some strange-looking dweller of the new and vastly strange wonderland that she could not make out. She politely introduces herself as Alice‚ thereby invoking a response from her companion to the effect that it was an electron. Alice also noted
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the more recent mechanic field of Quantum mechanics. Despite being outdated‚ Classical mechanics can still be used for many everyday problems with bigger and slower moving objects. However‚ when dealing with extremely fast moving or small subatomic particles a Classical approach will not produce sufficiently accurate results as was the case around the 19th century. Difficulties with the Classical mechanics theory came right around the 19th century. First was the Ultraviolet Catastrophe. Experimental
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(3:52) So what is dark matter? That was the big question. Astronomers were methodical. They listed every single thing they could think of that dark matter could possibly be: cold gas‚ dust‚ dead stars‚ rogue planets‚ everything. Even weird subatomic particles that were predicted to exist in quantum mechanics theories but never seen before. Then they thought of ways they could detect these objects. Cold gas would emit radio waves‚ for example. But everything they tried came up empty. One by one they
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h T c i m o t A n r e d o M Teacher: Mr. Silver y r eo Presentation By Sai Nikhil and group What is Modern Atomic Theory? Atomic theory is the scientific theory of the nature of matter. The theory states that matter is made up of small particles called atoms. Prior to this theory‚ matter was thought to be able to be divided into any small quantity. The word atom is derived from the Greek atoms‚ meaning indivisible. The Contributors • John Dalton. • Earnest Rutherford. • J. J. Thomson. • Albert
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form of stars and planets that we see. Observations show that there is far too little visible matter in the Universe to make up the 25% required by the observations. Second‚ it is not in the form of dark clouds of normal matter‚ matter made up of particles called baryons. We know this because we would be able to detect baryonic clouds by their absorption of radiation
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