Which of the following elements has the highest Electron Affinity (most negative ∆E)?

Carbon exists in different elemental forms in nature, including diamond and graphite. These two forms of carbon are examples of                                .

Which of the following elements has the largest 2nd ionization energy (IE2)?

Three possible Lewis structures are shown below for the thiocyanate ion, SCN-: Which of these Lewis Structures is/are the most favorable?  (Note: N is more electronegative than S)

Which of the following elements has the largest 1st Ionization Energy (IE1)?

What is the formal charge on the singly-bonded oxygen atom in the resonance structure of H2SO4 below?

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?