Here are six unknown elements and some of their properties. Study the properties, and then answer the question that follows. Six Unknown Elements and their Properties Element 1 State of matter: gas Conductivity: very poor Solubility (H2O): none Melting point: -157°C Element 2 State of matter: solid Conductivity: good Solubility (H2O): reacts rapidly Melting point: 777°C Element 3 State of matter: solid Conductivity: poor Solubility (H2O): none Melting point: 327°C Element 4 State of matter: liquid Conductivity: very poor Solubility (H2O): negligible Melting point: -7°C Element 5 State of matter: solid Conductivity: excellent Solubility (H2O): none Melting point: 1085°C Element 6 State of matter: solid Conductivity: good Solubility (H2O): reacts violently Melting point: 29°C