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What is the electronic configuration for the magnesium ion?

The sigma bond that is part of C=N in the following compound results from the overlap of which orbitals? 

Which of the following Lewis structures is correct?  

What is the electronic configuration for the oxide ion?

What is the correct Lewis structure for the molecule shown in the box below?

The following reaction mechanism contains mistakes. Which of the following statements correctly describes how the first curved arrows should be drawn?

Bonus question For the following reaction identify the acid and the base and predict the products.

For the following reaction identify the acid, base, conjugate acid and conjugate base.

For the following reaction, respectively identify the Brønsted-Lowry acid and the conjugate base.

Which of the indicated protons is most acidic?