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Name: _______________________ Date: _______________________ Learning Target: Performances of Understanding: I can explain the core, valence, radius (CVR) periodic table. -I will listen attentively while taking notes in Cornell format. -I will work collaboratively with the class to model atoms in CVR format using pool noodles -I will work independently to create a periodic table in CVR format that explains how the elements are classified based on their physical and chemical means. Criteria for Success: I can determine the effective core charge (effective nuclear charge) for any main group element on the periodic table. I can determine the number of valence electrons for any main group element on the periodic table. I can depict the relative atomic radius of any main group element on the periodic table. I can represent any main group element in CVR format. Notes Use this section of your notes to write questions, make connections, and sketch what you are visualizing! The CVR Periodic Table A. The core, valence, radius (CVR) model separates the ___________ level electrons from the _________ level electrons. 1. To determine the effective nuclear charge (Zeff) on an electron, subtract the number of ___________ shell electrons from the number of _______ in the nucleus. a. Effective nuclear charge is also referred to as effective ________ charge. 2. The _____________ level is the __________________ level of electrons and is most important in determining an atom’s chemistry. 3. The atomic____________ of an atom is the distance from the center of the ____________ and outer edge of the ___________ _________. a. The atomic radius is determined in large part by the pull of the positive ___________ in the nucleus and the number of main _________ levels. B. The resulting model simplifies the depiction of the atom and focuses on the _________ electrons which directly affect the _____________ of the atom. ¿Qué Dijo? Guided Practice Sodium Sodium Potassium Unit Four 80 Neon 1. What is the relationship between group number and the number of valence electrons? 2. What is the relationship between group number and the charge on the atomic core? ©Ross Lattner Publishing Unit Four 81