Explain the valences the electronic structure

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3) Write the electronic structures for the following elements: Co, S, Br, V, and Cu. (5 points) Explain the valences for each, showing what may happen to the electronic structure in each case. (Co can have valences of +2 and +3; S can have valences of -2, +2, +4, and+6; Br can have valences of -1 and +5; V can have valences of +2, +3, +4, and +5; and Cu can have valences of +1 and +2) 4) Derive the critical value of the radius ratio at which fourfold coordination is possible in a planar structure. As discussed in class this critical ratio is 0.414. (Hint: looking down on the planar structure, let the four large anions just touch the small cation in the center.)

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