The types of crystalline solids that are usually good conductors of heat and electricity are those that have valence electrons. It is the valence electrons that are responsible for the conduction of heat and electricity.
metals
metallic
ionic....
metaloid
It Could be Boron
Simply, the melting point. Think of an ice cube. The melting point is the temperature at which the ice cube MELTS into a liquid.
That depends on the solid: ice has a very low melting point, lard and butter have low melting points, chocolate has a relatively low melting point, wax has an intermediate melting point, lead has a high melting point, iron has a very high melting point, tungsten has an extremely high melting point.
The phase line between solid and liquid represents the melting point.The line dividing solid from gas is the sublimation point.The line dividing liquid from gas is the boiling point.
metaloid
Ionic solid...I'm assuming that this is an online homework question, and the correct answer is "An ionic solid"
High melting point High Boiling point Conducts electricity when molten or dissolved Cant conduct electricity when solid Example Sodium chloride
metallic
-Solid at room temperature -Very high melting points -Conducts electricity when disolved in water
This is the melting point.
Covalent solid
The metal lead. Solid at room temps, low melting point, good conductor of heat and electricity.
A contaminant reduces the melting point of a solid.
Water
Copper
B. it has a high melting point.