Based on the following properties, classify the given substance as ionic, covalent, or metallic. Justify your answer.
Melting Point: 800.8°C
Boiling Point: 1465°C
Solubility: Very soluble in Water
Crystal Structure: Forms cubic crystals
Malleability: Shatters when struck by a hammer
Conductivity: Conducts electricity when melted or dissolved in water, but not otherwise.
PLEASE HELP!