Imagine yourself in the shoes of Dimitri Mendeleev. You are provided with two sets of cards that list properties of various elements. These cards resemble the cards used by Mendeleev when he grouped elements. One set of cards lists the names of known elements and their properties, while the other set of cards lists the properties of a few unknown elements. These sets are shown below. Known Elements Set K Physical State: solid Density: 0.86 g/cm3 Conductivity: good Solubility (H2O): reacts rapidly Melting Point: 63oC I Physical State: solid Density: 4.93 g/cm3 Conductivity: very poor Solubility (H2O): negligible Melting Point: 113.5oC Au Physical State: solid Density: 19.3 g/cm3 Conductivity: excellent Solubility (H2O): None Melting Point: 1064oC Ge Physical State: solid Density: 5.32 g/cm3 Conductivity: fair Solubility (H2O): none Melting Point: 937°C Ba Physical State: solid Density: 3.6 g/cm3 Conductivity: good Solubility (H2O): reacts strongly Melting Point: 710°C Ar Physical State: gas Density: 0.00178 g/cm3 Conductivity: none Solubility (H2O): negligible Melting Point: -189.2°C Cl Physical State: gas Density: 0.00321 g/cm3 Conductivity: poor Solubility (H2O): slight Melting Point: -101°C Rb Physical State: solid Density: 1.53 g/cm3 Conductivity: good Solubility (H2O): reacts violently Melting Point: 39°C Ag Physical State: solid Density: 10.50 g/cm3 Conductivity: excellent Solubility (H2O): None Melting Point: 961°C Ca Physical State: solid Density: 1.57 g/cm3 Conductivity: good Solubility (H2O): reacts Melting Point: 845°C Si Physical State: solid Density: 2.33 g/cm3 Conductivity: intermediate Solubility (H2O): none Melting Point: 1410°C Xe Physical State: gas Density:3.64 g/cm3 Conductivity: very poor Solubility (H2O): none Melting Point: -111.9°C Unknown Elements Set Element 1 Physical State : gas Density : 0.00374 g/cm3 Conductivity: very poor Solubility (H2O): none Melting Point: -156.6oC Element 2 Physical State : solid Density: 2.54 g/cm3 Conductivity: good Solubility (H2O):