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What is the electron configuration for the Co2+ ion?

Which of the following Lewis structures would be an expansion to the octet rule?

Please upload your scratch paper here to receive credit for questions requiring sketches, Lewis Structures, calculations, etc. 

For a given arrangement of ions, the lattice energy increases as ionic radius ________ and as ionic charge ________.

What is the hybridization of the carbon atom attached to the two oxygen atoms in the structure below? 

Ortho-Dichlorobenzene, C6H4Cl2, is obtained when two of the adjacent hydrogen atoms in benzene are replaced with Cl atoms. A skeleton of the molecule is shown here.a. Complete a Lewis structure for the molecule using bonds and electron pairs as needed.b. Are there any resonance structures for the molecule? If so, sketch them.c. Are the resonance structures in (a) and (b) equivalent to one another as they are in benzene? Explain.

In the Lewis structure shown here, A, D, E, Q, X, and Z represent elements in the first two rows of the periodic table. Identify all six elements so that the formal charges of all atoms are zero. 

What is the electron configuration for the Co2+ ion?

Which of the following molecules or ions will exhibit delocalized bonding?  NO2- NH4+ N3-

Which of the following Lewis structures would be an expansion to the octet rule?