Transcription of Chapter 7
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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.
The Alkaline Earth Metals • The chemistry is dominated by the loss of two s electrons: M →→→ M2+ + 2e-. • Be does not react with water. • Mg will only react with steam. • Ca onwards: Ca( s) + 2H 2O( l) →→→ Ca(OH) 2(aq ) + H 2(g)
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