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?

In the AB3 molecule pictured here, what is the most likely identity of the peripheral atom, B?

Arrange the following three substances: NO+, NO2-, and NO3- in order of decreasing (largest to smallest) N-O bond length.

In which of the following molecules is the carbon-carbon bond distance the shortest?

Consider the following probability functions for the 1s, 2s and 3s orbitals: Which of these statements is false?