Magnesium sulfide melting point is the temperature at which the compound melts.
Several factors influence the melting point of an inorganic solid. One of the most important is its lattice energy. The higher the lattice energy, the less soluble a solid is in water, and it also increases its hardness.
Another factor is its charge and ionic size. The larger the charge and smaller the ionic size, the higher its lattice energy.
This is why a compound with a high charge and small ionic radius, like magnesium fluoride, has a lower melting point than a compound with a low charge and large ionic size, like calcium oxide. It’s because the force of attraction between these ions is dependent on their distance from each other, and their interionic distance is greater in the case of fluoride than in the case of oxide.
The other important factor in determining the melting point of a substance is its lattice energy. As the lattice energy increases, it will also increase the melting point of the compound.
Ionic compounds, which are ionic crystals (ionic solids), have a different lattice energy than molecular, atomic and hydrated ions. This is because the ionic crystals form a strong electrostatic field, with the ions forming a bond to each other.
The ionic bond between magnesium and sulfur forms an ionic compound, called MgS. It can be formed when magnesium reacts with sulfur or it can be synthesized by adding sulfur to magnesium.