Final answer:
The element He is diamagnetic because there are no unpaired electrons in its electron configuration.
Step-by-step explanation:
In order to determine if an element is paramagnetic or diamagnetic, we need to examine its electron configuration. The electron configuration of He is 1s², which means it has two electrons in the 1s orbital. Since both electrons are paired, there are no unpaired electrons. Therefore, He is diamagnetic and not paramagnetic.