Final answer:
The primary element of a JSA is Rb and the question to ask when performing the task is regarding the symbol and charge of the cation and anion.
Step-by-step explanation:
The primary element of a JSA refers to the element with the lowest first ionization energy. In this case, the element at the bottom left of the rectangle in the two far-left columns of the periodic table will have the lowest first ionization energy. This element is Rb (Rubidium).
When performing the task, the question you should ask yourself is:
- What is the symbol and charge of the cation (metal)?
- What is the symbol and charge of the anion (nonmetal)?