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): _____________________________
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
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?