Copper is a solid state of matter at room temperature. It has a typical metallic luster and conducts heat and electricity well.
Potassium chloride conducts electricity when molten because the ions are free to move and carry electric charge. In the solid state, the ions are held in fixed positions and cannot move freely to conduct electricity.
One example of a substance that conducts electricity in its aqueous state but not in its solid state is sulfuric acid. In its aqueous state, sulfuric acid ionizes into ions that are able to carry an electric current, whereas in its solid state it does not have the mobility of ions to conduct electricity.
Sodium chloride fits this description. It has a melting point of 1074 K and conducts electricity when dissolved in water as it dissociates into sodium and chloride ions, but does not conduct electricity in the solid state because the ions are not free to move.
Ionic compounds are formed by the attraction between positively and negatively charged ions. They have high melting and boiling points. Ionic compounds are usually solid at room temperature. They conduct electricity when dissolved in water or melted.
platinum
Copper is a solid state of matter at room temperature. It has a typical metallic luster and conducts heat and electricity well.
Usually a solid conductor is a metal but there are exceptions. For example graphite is nonmetallic but it conducts electricity.
A substance that conducts electricity is a conductor. There is no special name for one that is solid; if you need to specify that it is solid, just call it a "solid conductor".
Silver is a shiny solid that conducts electricity very well due to its high electrical conductivity. It is commonly used in electrical applications like circuits and connectors.
Potassium chloride conducts electricity when molten because the ions are free to move and carry electric charge. In the solid state, the ions are held in fixed positions and cannot move freely to conduct electricity.
metaloid
an arch of electricity is when a solid that conducts power comes too close to a metal that is electrified and gets electricuted.
Not in its normal, solid form but it will when molten or dissolved in water.
One example of a substance that conducts electricity in its aqueous state but not in its solid state is sulfuric acid. In its aqueous state, sulfuric acid ionizes into ions that are able to carry an electric current, whereas in its solid state it does not have the mobility of ions to conduct electricity.
Liquid mercury can conduct electricity, it's what makes mercury thermostats work. As for solid mercury, it conducts electricity in solid phase as all metals do.
Ag (silver) because it is a metal and metals conduct electricity no matter in solid or liquid phase.