Chapter 2 Atomic Structure and Interatomic Bonding

Chapter 2 Atomic Structure and Interatomic Bonding -...

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Chapter 2 Atomic Structure and Interatomic Bonding Fundamental Concepts Atomic #, Z = number of protons in the nucleus o For the neutral or complete atom this tells the number of electrons too Atomic mass, A = specific atom may be expressed as the sum of the masses of protons and neutrons Isotopes = an atom of a certain element that are different in character/number of neutrons Atomic weight = weighted average of atomic masses of an atom’s naturally occurring isotopes Atomic mass unit, amu = may be used for computations of atomic weight, 1 amu = 1/12 of the atomic mass of the most common isotope of carbon A = Z + N Atomic weight of an element or molecular weight of a compound may be specified on the basis of amu per atom (molecule) or mass per mole of material In one mole there are 6.02*10^23 atoms or molecules Electrons in Atoms Bohr atomic model = electrons are assumed to revolve around the atomic nucleus in discrete orbitals and the position ofany particular electron is more or less well defined in terms of its orbital Wave mechanical model = the electron is considered to exhibit both wave-like and
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This note was uploaded on 10/02/2011 for the course ENME enme382 taught by Professor Bruck during the Fall '10 term at Maryland.

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Chapter 2 Atomic Structure and Interatomic Bonding -...

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