Lesson 5-Periodicity PDF

Atomic Properties and Periodicity Prepared by: Abegail B. Palcongan Learning Targets At the end of the lesson you are able to: predict and/or justify trends in atomic properties based on location on the periodic table. Special Names for Groups in the Periodic Table Electron Configurat...

Atomic Properties and Periodicity Prepared by: Abegail B. Palcongan Learning Targets At the end of the lesson you are able to: predict and/or justify trends in atomic properties based on location on the periodic table. Special Names for Groups in the Periodic Table Electron Configuration and Periodicity  Atomic properties and periodicity Ionization Energy Electron Affinity Atomic Radius Atomic properties and periodicity: Ionization energy Ionization Energy -Energy required to remove an electron from a gaseous atom or ion. * Core electrons are bound much more tightly than valence electrons.  Atomic properties and periodicity: Ionization energy In general, as we go across a period from left to right, the first ionization energy increases. Why? Electrons added in the same principal quantum level do not completely shield the increasing nuclear charge caused by the added protons. In general, as we go down a group from top to bottom, the first ionization energy decreases. Why? The electrons being removed are, on average, farther from the nucleus.  Atomic properties and periodicity: Ionization energy Explain why the graph of ionization energy versus atomic number (across a row) is not linear. electron repulsions Where are the exceptions? some include from Be to B and N to O Atomic properties and periodicity: Ionization energy Which atom would require more energy to remove an electron? Why? Na Cl Atomic properties and periodicity: Ionization energy Which atom would require more energy to remove an electron? Why? Li Cs  Atomic properties and periodicity: Ionization energy Write the appropriate symbol (> or or