The electron configurations of five different elements are shown below. Which of these elements is expected to have the largest second ionization energy (IE2)?

The element Ar and the ions Ca2+, K+, and Cl- have the same number of electrons.  Why does the chloride ion (Cl -) have the largest radius of this isoelectronic series?

Hydrogen peroxide decomposes to water and oxygen via the following process: 2 H2O2 (l)

A red laser pointer emits light with a wavelength of 650 nm.  What is the energy gap (in eV) between the ground and excited state in the laser material?

With the exception of one of the species below, you can draw a valid Lewis Structure without violating the octet rule. Which species below must have an expanded octet?

Which of these elements has the shortest distance from the center of the nucleus to the outermost valence electron?

The electrical conductivities of the following 0.100 M solutions were measured with Jim’s light bulb conductivity apparatus: HF, KI, CH3OH, Al(NO3)3.  Rank these solutions in order of decreasing intensity (brightest to dimmest) of the light bulb:

Consider the following beakers: In which of these beakers will a chemical reaction occur?

What classification is given to a substance that produces hydroxide (OH-) ions when added to water?

Paying attention in lecture question! The double slit experiment was discussed in two of the video clips we watched from Ch. 6 and shows the wave-particle duality of light as it travels through two tiny slits. What was the light source used for this experiment?