What is the charge state of materials that can store electrical energy and have a full valence ring?

Materials that have a full valence electron shell, such as noble gases (e.g., helium, neon, argon), are generally considered neutral because they do not readily gain or lose electrons. This stable configuration means these materials have an equal number of protons (positively charged) and electrons (negatively charged), resulting in no net charge.

In the context of electrical energy storage, materials that can effectively store energy (like capacitors) rely on the movement of charge. However, materials that possess a filled valence ring are inherently stable and do not possess an excess of either charge, making them neutral overall. This understanding is key to grasping the fundamental concepts of electrical properties in materials.