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djay92806

Answer: Diamond is covalent crystal. It has the highest melting point because high energy covalent bonds hold the crystal together.

Explanation: Covalent bonds are very strong, so covalent network solids typically have the highest melting points out of all four types of solids.

blossomcotton124

Answer:

giant covalent solids

Ionic solids also have high melting points, often over 1000 degrees but they can vary. Some are often low enough to melt in the lab with a Bunsen burner: