Quantum-Mechanical Elements of the Atom
Quantum-Mechanical Elements of the Atom CHEM 101
Popular in Structural Chemistry, with Application to Chemistry of the Elements
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This 2 page Class Notes was uploaded by Piper Daniels on Tuesday September 22, 2015. The Class Notes belongs to CHEM 101 at University of Alabama - Tuscaloosa taught by Mrs. Leung in Fall 2015. Since its upload, it has received 35 views. For similar materials see Structural Chemistry, with Application to Chemistry of the Elements in Science at University of Alabama - Tuscaloosa.
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Date Created: 09/22/15
Chapter 3 dblock 1 transition elements Group 1888 2 n period 1 fblock 1 Inner transition metals a lanthanides located in period 6 b actinides located in period 7 2 n period 2 Ex Sulfur 1s22s22p63s23p4 Ex Se 1s22s22p63s23p64s23d104p4 Shorthand 1 use noble gases Group SA as abbreviations Ex C 6 electrons 1s22s22p2 or He2s22p2 Irregular Electron Configuration 1 elements in the d and f block 2 Cr Ar4s23d4 this is incorrect Cr Ar4s13d5 this is correct Reasoning This is more stable than 3d4 because all of the electrons have separate orbitals keeping electronelectron repulsion from happening 3 Cu Ar4s23d9 this is incorrect Cu Ar4s13d1O this is correct For the same reasons as stated above a Ag and Au also follow this same pattern Must Know 1 sblock 2 pblock 3 dblock elements in period 4 Y Zr Tc Cu Ag Au Zn Cd and Hg irregular Valence Electrons 1 Valence electrons are the electrons in the atom that form chemical bonds with other atoms a usually furthest from the nucleus 2 Core electrons all the electrons except the valence electrons a Number of core electrons total electrons valence electrons Ex C 1s22s22p2 224 valence electrons main group element gt s amp p block valence electrons are located in the outermost shell highest principal she a You can still use shorthand form for this b Group number A number of valence electrons c C G4A 4 valence electrons 3 Transition elements Group 1888 a Valence electrons are those in outermost shell incomplete dsubshell or incomplete f subshell
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