ch2 - Chapter II Chapter Atomic Structure and Interatomic...

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Chapter II Chapter II Atomic Structure and Atomic Structure and Interatomic Bonding Interatomic Bonding
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The periodic table of the elements The periodic table of the elements 58 59 60 61 62 63 64 65 66 67 68 69 70 71 Ce Pr Nd Pm Sm Eu Gd Tb Dy Ho Er Tm Yb Lu 90 91 92 93 94 95 96 97 98 99 100 101 102 103 Th Pa U Np Pu Am Cm Bk Cf Es Fm Md No Lw I A O 1 2 H II A IIIA IVA V A VIA VIIA He 3 4 5 6 7 8 9 10 Li Be B C N O F Ne 11 12 VIII 13 14 15 16 17 18 Na Mg IIIB IVB V B VIB VIIB I B IIB Al Si P S Cl Ar 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 K Ca Sc Ti V Cr Mn Fe Co Ni Cu Zn Ga Ge As Se Br Kr 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 Rb Sr Y Zr Nb Mo Tc Ru Rh Pd Ag Cd In Sn Sb Te I Xe 55 56 57 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 Cs Ba La Hf Ta W Re Os Ir Pt Au Hg Tl Pb Bi Po At Rn 87 88 89 Fr Ra Ac
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Structure of atoms Structure of atoms Electrons \ Atom Nucleus Protons Neutrons Carbon Atom
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What makes an element different to What makes an element different to another? another? * The number of protons in the nucleus -- the Atomic Number ( Z ) which is equal to the number of electrons for a complete atom. For Example: Carbon C 12 : 6 Protons + 6 Neutrons + 6 Electrons C 13 : 6 Protons + 7 Neutrons + 6 Electrons C 4+ : 6 Protons + 6 Neutrons + 2 Electrons It is the number of Protons makes different chemical elements. N 14 : 7 Protons + 7 Neutrons + 7 Electrons
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Fundamental Concepts Fundamental Concepts Atomic mass ( A ): = protons + neutrons (the mass of proton and neutron = 1.66x10 -24 g) Isotope: various forms of an element that differ in the number of neutrons in the nucleus. ( 12 C, 13 C) Atomic weight: average of atomic masses of the atom’s isotopes. ( atomic weight of C = 12.01 amu ) Atomic mass unit (amu): 1 amu = 1 / 12 of the atomic mass of carbon 12 ( 12 C). Mole: 6.023 x 10 23 atoms or molecules is one mole of the substance. amu §¨ mole: 1 (amu/atom or molecule) = 1 (g/mole) Avogadro’s number
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Sample Problem Sample Problem From the Periodic Table, we know that the atomic mass of iron (Fe) is 55.85 amu/atom.
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This note was uploaded on 10/25/2011 for the course HUMA 002 taught by Professor Yu during the Spring '11 term at Alcorn State.

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ch2 - Chapter II Chapter Atomic Structure and Interatomic...

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