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Magnesium Sulfide ionic bond
Sodium sulphate.
The Roman Numerals in elements such as Cu (II) for copper represents the number of electrons in the outer shell that can be transferred when creating an ionic compound Such as Co (II) can give off two electrons when forming an ionic compound.
Iron chloride
A molecule, if the species is molecular. If the species is ionic, it is the unit cell, since it cannot be broken down into individual molecules.