CH 101 Lecture Notes - Lecture 4: Effective Nuclear Charge, Main-Group Element, Electron Configuration
23 Nov 2016
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Periodic table: originally only have 65 elements, dmitri mendeleeve organized then by mass. Modern periodic table is organized by increasing atomic number (#p) Example: cobalt 27, nickel 28 (58. 93 amu) (58. 69 amu, elements in the same column have similar chemical and physical properties. Similarities can be explained by the location of the electrons. Organization of table: row of periodic table = period. Period 1 = hydrogen and helium: groups/columns. H, li, na, k , r(cid:271) group 1: main group elements the elements that are most abundant on earth/universe. Elements with incomplete d-subshell or becomes incomplete as cations (if not all 5 d-orbitals are filled. Last 2 rows on periodic table (ones not on actual table) Lanthanides: period 6, between group 3b and 4b (ce to lu) Actinides: period 7, between group 3b and 4b (th to lr) Electron configuration: electron configuration shows the particular orbitals electrons are located.
