Which of the following is not an example of elemental solid dielectric?

An elemental solid dielectric refers to a substance made of a single type of atom that insulates or resists electrical conduction in its solid state. Given the context of your question, to identify something that is not an example of an elemental solid dielectric, we need to look at elements and their common states under standard conditions. Most elemental solids do not act as dielectrics because dielectrics are usually insulating materials, and most elemental solids are metals which conduct electricity. Some non-metals, like sulfur or phosphorus, can form solid structures that do not conduct electricity under normal conditions and could theoretically act like dielectrics. However, the most classic examples of solid dielectrics are not elemental but rather compounds, such as silicon dioxide or various polymers.

Since I need to point out a specific example from a list and you haven’t provided a list of options, I’ll note that an incorrect example of an elemental solid dielectric based on common elements would be:

“Silver (Ag)”

Silver is not a dielectric material; it is a metal known for its high electrical and thermal conductivity.