Atoms - Must be something positively charged in the gold...

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2.2 What are atoms? Very small Ba has a diameter of 444 pm Very little mass Ba atom has a mass of 2.28 * 10-22 g Smallest particle that still exhibits some properties of the element
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2.2 History of the Atom Abbreviated: Thompson found the charge to mass ratio of small particles, called electrons Milliken found the charge of electrons and used Thompson’s ratio to solve for mass of electron Mass of electrons = 9.11 * 10-31 kg Smaller mass than the smallest atom
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2.2 Early atomic model Thompson’s Plum pudding model: + + + + +
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2.2 Rutherford Rutherford fired a ray of positively charged alpha particles at gold film A small amount of the particles bounced back
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Unformatted text preview: Must be something positively charged in the gold This something must take up very little space in the gold The nucleus , the positively charged center of the atom 2.2 Picture of the atom 2.2 Current Atomic Theory • Three components: – Protons • Positively charged particles – Neutrons • Neutral particles – Electrons • Negatively charged particles • Atoms are electrically neutral, having same number of protons and electrons 2.2 Atomic Theory Particle Location Charge Mass (amu) Proton Nucleus + 1.007 Neutron Nucleus Nope 1.009 Electron Orbits nucleus-0.000549 Almost all of the atom’s mass is in the nucleus...
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This note was uploaded on 01/19/2012 for the course CHEM 1211 taught by Professor Hair during the Spring '08 term at Kennesaw.

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Atoms - Must be something positively charged in the gold...

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