As relates to the ECT capacity, when it comes to conductivity, we are primarily focused on the electrons of the outermost shell of an atom. When an atom has 1-3 electrons in the outer shell, the material will conduct electricity when the atoms are pushed by voltage.
CERTAIN MATERIALS ARE BETTER CONDUCTORS THAN OTHERS. For instance, according to the International Annealed Copper Standard (IACS), copper is the perfect conductor. This is because pure copper has a base value of 100%. A base value of 100% makes it an ideal material that offers zero resistance and, therefore, is a pure conduit for electricity.