What is the oxidation number of each oxygen atom in the compound, potassium peroxide?

What type of bonding is characterized by two nonmetal atoms sharing a pair of valence electrons equally between them?

In the AB4 molecule pictured below, what is the most likely identity of the central atom, A?

What element and type of hybridization is illustrated in the electron box diagrams below?

Which of the following pairs of substances are allotropes?

Which of the following molecules has three equivalent resonance structures?

Which of the following metals would you expect to react most violently with water?

What is the hybridization of the carbon atom notated with an arrow in the Morphine molecule shown below?

Electron Affinity (EA) values generally increase from left to right on the Periodic Table. However, there are three columns where there is an exception to this trend.  What are these three columns?

In which of the following species does the central atom have an expanded octet?