Final answer:
Smaller ions tend to have higher conductance because they can move more freely through a solution, whereas larger ions move more slowly and have lower conductance. Factors like the concentration of ions, type of substance dissolved, and temperature also significantly influence conductance.
Step-by-step explanation:
The trend we see in ions and their conductance is that smaller ions generally have higher conductance. This is because ions with smaller ionic radii can move more freely through a solution, resulting in better conduction of electricity. Larger ions, having more mass and potentially a more complex electron cloud, move more slowly and have lower conductance. Therefore, electric charges move more easily in a conductor, where there can be a large number of free electrons available, than in an insulator. Also, other factors affecting conductance include the concentration of ions; the higher the concentration, the better the conduction. Moreover, materials that are strong electrolytes will have higher conductivity due to the ease of forming ions. Temperature also plays a role; higher temperatures usually increase the number of free charges due to increased solubility of substances and higher thermal agitation, resulting in better conductivity.