Final answer:
The minerals that are very good conductors of electricity due to the movement of electrons are metals, because they have a 'sea' of delocalized electrons that allow charges to move freely through the substance.
Step-by-step explanation:
The correct answer to the question about which class of minerals are very good conductors due to the ability of the electrons to move around is a. metals. Metallic crystals have a structure where metal cations are surrounded by a "sea" of mobile valence electrons. These delocalized electrons are free to move throughout the entire crystal, which is why metals are good conductors of electricity. The electrical conductivity of metals is due to these free electrons, which are not bound to any one atom and can move through the material. This allows electric charges to flow relatively freely, making metallic solids not only good conductors of electricity but also of heat. The melting points of these metals depend strongly on the electron configuration.
Metals such as iron are known for their conductivity, ability to conduct electricity and heat efficiently, and their other physical properties like malleability and ductility. In contrast, nonmetals are generally poor conductors of electricity and heat.