MCE 230_ F10_lec_3 - MCE 230 – Materials science Fall...

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Unformatted text preview: MCE 230 – Materials science Fall 2010 Lecture - 3 Introduction Modern Materials’ Needs Most of the used materials are from nonrenewable resources, and so the are gradually becoming depleted. So what can we do? Discover additional reserves. Develop new materials Increase recycling efforts Materials Selection Cost & availability Shape Atomic Structure Atom Atom consists of : Protons: in nucleus------Charge = + 1.60 x 10-19 C -------- mass = 1.67 x 10-27 kg Neutrons: in nucleus------Charge = neutral -------- mass = 1.67 x 10-27 kg Electrons: Moving around nucleus ------Charge = - 1.60 x 10-19 C -------- mass = 9.11x 10-31 kg Atomic number (Z): the number of protons in the nucleus Atomic mass (A): the sum of masses of protons and neutrons within the nucleus. For a given element the number of protons is the same, the number f neutrons may vary so atoms of some elements may have more than one atomic mass ( isotopes ) Atomic weight: is the average weight of atomic masses of an element ....
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This note was uploaded on 12/05/2010 for the course MECHANICAL mce 230 taught by Professor Bassildrass during the Fall '10 term at American University of Sharjah.

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MCE 230_ F10_lec_3 - MCE 230 – Materials science Fall...

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