Chapter7 - CHEMISTRY 1307 Chapter VII The Structure of Atoms and Periodic Trends 1 General Periodic Trends Atomic and ionic size Ionization energy

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10/16/2011 1 1 CHEMISTRY 1307 Chapter VII The Structure of Atoms and Periodic Trends 2 General Periodic Trends Atomic and ionic size Ionization energy Electron affinity Higher effective nuclear charge Electrons held _______ tightly Larger orbitals. Electrons held _____ tightly. 3 Atomic Radii of Elements Consider a simple diatomic molecule. The distance between the two nuclei is called the ____________ . If the two atoms which make up the molecule are the same, then half the bond distance is called the ________________ of the atom. The covalent radius of chlorine is: (198 pm/2) = 99 pm. If one knows the bond distance in a heteronuclear bond, then the radius of another atom can be estimated. r Carbon = 176 pm – 99 pm = 77 pm
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10/16/2011 2 4 Atomic Radii of Elements 5 Atomic Radii of 1 A Elements Moving down group 1, we see the atomic radii increase with __________ quantum number n = 1 n = 2 n = 3 n= 4 n = 5 n = 6 Group(1) radii 0 50 100 150 200 250 300 0 1 2 3 4 5 6 7 n r (pm) 6 Atomic Radii in 3rd Period Moving across the 3 rd period we see the atomic radii of the elements __________. 3rd period radii 80 100 120 140 160 180 200 0 1 2 3 4 5 6 7 8 group number
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10/16/2011 3 7 Atomic Size Size goes _____ on going down a group, because electrons are added further from the nucleus, there is less attraction.
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This document was uploaded on 10/30/2011 for the course CHEM 1307 at Texas Tech.

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Chapter7 - CHEMISTRY 1307 Chapter VII The Structure of Atoms and Periodic Trends 1 General Periodic Trends Atomic and ionic size Ionization energy

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