The intensity of the molecular fluorescence of a compound is related to all of these parameters except. a.) the power of the excitation radiation b.) the fluorescence quantum efficiency of the fluorescing molecule c.) the molar mass of the compound d.) the absorptivity of the compound

a) excitation radiation

Explanation:

the fluorescence quantum efficiency of the fluorescing molecule:

Molecular structure and its chemical environment influence whether a substance will fluoresce and the intensities of these emissions. The quantum yield or quantum efficiency is used to measure the probability that a molecule will fluoresce or phosphoresce. For fluorescence and phosphorescence is the ratio of the number of molecules that luminescent to the total number of excited molecules. For highly fluoresce molecules, the quantum efficiency approaches to one.Molecules that do not fluoresce have quantum efficiencies that approach to zero.

the molar mass of the compound

Influence of a halogen substitution decreases fluorescence as the molar mass of the halogen increases. This is an example of the “heavy atom effect” which suggest that the probability of intersystem crossing increases as the size of the molecule increases.  As the molar mass of the substituted compound increases, the relative intensity of the fluorescence decreases.

The absorptivity of the compound

he molar absorptivity, which measures the probability that a transition will occur

you need to take a look at the periodic system in order to sort these elements into pairs that would most likely exhibit similar chemical properties. first, you need to find elements that are found in the same group (groups are vertical in the periodic system), and then to see whether they have the same valence number. if they meet these criteria, they will have similar properties.

the first pair: ne (neon) and kr (krypton), are noble gases found in group 8

the second pair: li (lithium) and k (potassium), found in group 1

the third pair: s (sulfur) and te (tellurium), found in group 6