Chapter 7
Chapter 7. Effective Nuclear Charge Size of Atoms & Ions Ionization electron Affinity periodic TRENDS. Arises from the periodic patterns in electron CONFIGURATIONS. Elements in the same GROUP have the same number of VALENCE electrons VALENCE electrons = electrons in the outermost orbital EFFECTIVE NUCLEAR CHARGE. The NET positive charge experienced by an electron . Core electrons pulled in tightly Valence electrons held less tightly Shielding effect reduces the full nuclear charge of outer electrons Effective Nuclear Charge BASED On The periodic . RECURRENCE Of PROPERTIES. periodic Trends In Sizes of atoms and ions. Ionization energy. electron affinity. Sizes of atoms As we move down a group, the atoms become larger. Due to INCREASING value of n SIZES OF ATOMS. BUT !! As we move ACROSS a period, {left to right}.
7.1 PERIODIC TRENDS • Arises from the Periodic patterns in ELECTRON CONFIGURATIONS. • Elements in the same GROUP have the same number of VALENCE electrons •VALENCE electrons = electrons in the outermost orbital
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