Name: __________________________

• 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.

Periodic table extra credit

I independently completed this assignment (signature): _____________________________

Atomic radii (CN 6) of common oxidation states

1A 2A

3B 4B 5B 6B 7B 8B 8B 8B 1B 2B

3A 4A 5A 6A 7A

8A

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?