Which of the following do lewis structures help us understand?

Tell me the iupac name of the following compounds:

Click the button that shows the correct relationship of the electron affinities of the elements sodium and phosphorus. sodium’s electron affinity value is more negative than the electron affinity value of phosphorus. phosphorus’ electron affinity value is more negative than the electron affinity value of sodium. this information cannot be determined using the periodic table. answer is b on e2020.

What is the common name for the compound shown here? enter the common name of the compound shown?