Lecture 7 - Quote of Day hat we use in society is either...

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Unformatted text preview: Quote of Day hat we use in society is either extracted from the earth by mining/drilling/etc or grown. Chapter 3 Matter and Minerals . An atom is the most elementary matter that can not be broken apart / separated by normal physical or chemical processes . Three basic components of an atom => protons (+), neutrons, and electrons (-) . Proton and neutrons reside in the center (nucleus) of the atom . Electrons orbit around the nucleus in specific orbits or energy states (electrons behavior sometimes like particles and sometimes like bundles of energy similar to light behaving sometimes as “particles” called photons and sometimes as waves) http://www.olympusmicro.com/primer/java/particleorwave/diffraction/particlediffractionfigure1.jpg https://secure.cnchost.com/laserprofessor.com/pimages/AtomicStruct.jpg 5. Most of the mass of an atom is contained in the nucleus 6. An element is defined by the number of protons (“atomic number”) • Hydrogen (H) has one proton • Helium (He) has two protons • Lithium (Li) has three protons 7. The number of neutrons are commonly the same as the number of protons in the nucleus, though not always (“isotopes”) • 99.9999% of helium has two neutrons ( 4 He) • 00.0001% of helium has one neutron ( 3 He) Figure 3.4A 8) Some isotopes are stable through time (“stable isotopes”); others change through time (“radioactive isotopes”) 99.989% of hydrogen has no neutrons (1H) and is stable 00.011% of hydrogen has one neutron (2H) and is stable Very small amount of hydrogen has two neutrons (3H) and is unstable (radioactive) => called “tritium” and can be used to make an atomic bomb! . ....
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This note was uploaded on 04/18/2011 for the course EAS 101 taught by Professor Kirschner during the Spring '11 term at Saint Louis.

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Lecture 7 - Quote of Day hat we use in society is either...

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