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  1. Name: __________________________ Periodic table extra credit • This exercise must be completed BY YOURSELF, and not as a group. You must sign the affidavit at the bottom of this page attesting to this fact. Please follow these instructions carefully! • In the provided skeletal periodic table, fill in the ionic radii (“IR” column) of the elements in their typical oxidation state, and with a coordination number of 6 (VI on table). Make sure you do NOT use the covalent radii (“CR” column). Choose oxidation states as specified below: • The typical oxidation state for the “A” group elements is their group number (+). • The typical oxidation state for the transition metals (“B” group) is “+3”. If there is not an entry for the +3 oxidation state, use the +2 oxidation state. • The typical oxidation state for lanthanide elements is +3. • Let’s also use +3 oxidation states for the actinides (instead of the usual +4). Finally, answer the summary questions about the ionic radii trends. I independently completed this assignment (signature): _____________________________

  2. Atomic radii (CN 6) of common oxidation states 1A 2A 8A 3A 4A 5A 6A 7A 3B 4B 5B 6B 7B 8B 8B 8B 1B 2B

  3. Periodic trends • Comment on any boxes that you were unable to properly fill in. • Comment on the relative sizes of the major classes of elements (s-block, p-block, d-block, f-block) • Comment on the general periodic trends in ionic radii, and on the trends within the classes above • Comment on any notable exceptions to the trends you observe • Yttrium is often treated as a rare earth element. Based on its ionic radius, where does it fit within the lanthanide series?