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Atomic radii (CN 6) of common oxidation statesPowerPoint Presentation

Atomic radii (CN 6) of common oxidation states

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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 table exercise

- Let us map out the ionic radii (“IR” column) of elements in their typical oxidation state, and with a coordination number of 6 (VI on table). Your group number will determine which elements you work with. Make sure you do NOT use the covalent radii (“CR” column). Work together to figure out the ionic radii for your group’s elements, and then write them on the board.
(1-8 = A/B groups of your #; 9 = Lanthanides; 10 = Actinides)

- 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, and write the radius with yellow chalk.
- The typical oxidation state for lanthanide elements is +3.
- Let’s also use +3 oxidation states for the actinides (instead of the usual +4).
- Want to practice filling in elements? Visit the site: http://www.ilpi.com/genchem/instantquiz.html

Bond valence sum analysis

V = total valence of metal

vi = contribution from ith bond

R0 = coefficient specific for bond

b = 0.37

For iron:

R0 ~ 1.747

BVS sum indicates Fe+2.17

V = 2.17

(.23 + .37 + .55 +.39 +.25 +.38)

0.23

0.37

0.55

0.38

0.25

0.39

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