1. Li Lithium Physical State (at STP): Solid Density: 0.534 g/cm 3 Hardness (Mohs Scale): 0.6 Conductivity: Good Solubility (H 2 O): reacts Melting Point: 180 °C Color: silver Valence: 1 Unknown #3 Physical State (at STP): Solid Density: 1.53 g/cm 3 Hardness (Mohs Scale): 0.3 Conductivity: Good Solubility (H 2 O): reacts violently Melting Point: 39 °C Color: silvery white Valence: 1 Na Sodium Physical State (at STP): Solid Density: 0.971 g/cm 3 Hardness (Mohs Scale): 0.5 Conductivity: Good Solubility (H 2 O): reacts rapidly Melting Point: 98 °C Color: silver Valence: 1 K Potassium Physical State (at STP): Solid Density: 0.86 g/cm 3 Hardness (Mohs Scale): 0.4 Conductivity: Good Solubility (H 2 O): reacts rapidly Melting Point: 63°C Color: silver Valence: 1

2. Cs Caesium Physical State (at STP): Solid Density: 1.87 g/cm 3 Hardness (Mohs Scale): 0.2 Conductivity: Good Solubility (H 2 O): reacts violently Melting Point: 29 °C Color: silvery white Valence: 1 Unknown #2 Physical State (at STP): Gas Density: 0.00170 g/cm 3 Hardness (Mohs Scale): none Conductivity: Very poor Solubility (H 2 O): slight Melting Point: -219.6 °C Color: pale yellow Valence: 7 Cl 2 Chlorine Physical State (at STP): Gas Density: 0.00321 g/cm 3 Hardness (Mohs Scale): none Conductivity: Very poor Solubility (H 2 O): slight Melting Point: -101 °C Color: greenish yellow Valence: 7 Br Bromine Physical State (at STP): Liquid Density: 3.12 g/cm 3 Hardness (Mohs Scale): none Conductivity: Very poor Solubility (H 2 O): negligible Melting Point: -7.2°C Color: reddish-brown Valence: 7

3. I 2 Iodine Physical State (at STP): Solid Density: 4.93 g/cm 3 Hardness (Mohs Scale): unknown Conductivity: Very poor Solubility (H 2 O): negligible Melting Point: 113.5 °C Color: bluish-black Valence: 7 Unknown #1 Physical State (at STP): Solid Density: 2.33 g/cm 3 Hardness (Mohs Scale): 6.5 Conductivity: Intermediate Solubility (H 2 O): none Melting Point: 1410°C Color: grey Valence: 4 C Carbon Physical State (at STP): Solid Density: 2.10 g/cm 3 Hardness (Mohs Scale): 0.5 Conductivity: Good Solubility (H 2 O): negligible Melting Point: 3550°C Color: black Valence: 4 Pb Lead Physical State (at STP): Solid Density: 11.35 g/cm 3 Hardness (Mohs Scale): 1.5 Conductivity: Poor Solubility (H 2 O): none Melting Point: 327.5°C Color: grey Valence: 4

4. Sn Tin Physical State (at STP): Solid Density: 7.31 g/cm 3 Hardness (Mohs Scale): 1.5 Conductivity: Good Solubility (H 2 O): none Melting Point: 232 °C Color: silver Valence: 4 Unknown #7 Physical State (at STP): Solid Density: 5.32 g/cm 3 Hardness (Mohs Scale): 6.0 Conductivity: Fair to Poor Solubility (H 2 O): none Melting Point: 937°C Color: grey Valence: 4 Ga Gallium Physical State (at STP): Solid Density: 5.904 g/cm 3 Hardness (Mohs Scale): 1.5 Conductivity: Medium Solubility (H 2 O): none Melting Point: 30°C Color: silvery Valence: 3 In Indium Physical State (at STP): Solid Density: 7.31 g/cm 3 Hardness (Mohs Scale): 1.2 Conductivity: Medium Solubility (H 2 O): none Melting Point: 157°C Color: silvery white Valence: 3

5. Cu Copper Physical State (at STP): Solid Density: 8.96 g/cm 3 Hardness (Mohs Scale): 3 Conductivity: Excellent Solubility (H 2 O): none Melting Point: 1803 °C Color: copper Valence: 1 or 2 Unknown #9 Physical State (at STP): Solid Density: 11.85 g/cm 3 Hardness (Mohs Scale): 1.2 Conductivity: Medium Solubility (H 2 O): none Melting Point: 303°C Color: silvery white Valence: 3 Ag Silver Physical State (at STP): Solid Density: 10.5 g/cm 3 Hardness (Mohs Scale): 2.5 Conductivity: Excellent Solubility (H 2 O): none Melting Point: 961°C Color: silver Valence: 4 Be Beryllium Physical State (at STP): Solid Density: 1.85 g/cm 3 Hardness (Mohs Scale): 5.5 Conductivity: Excellent Solubility (H 2 O): none Melting Point: 1287°C Color: grey Valence: 2

6. Ca Calcium Physical State (at STP): Solid Density: 1.57 g/cm 3 Hardness (Mohs Scale): 1.75 Conductivity: Good Solubility (H 2 O): reacts Melting Point: 845 °C Color: silvery white Valence: 2 Unknown #5 Physical State (at STP): Solid Density: 19.3 g/cm 3 Hardness (Mohs Scale): 2.5 Conductivity: Excellent Solubility (H 2 O): none Melting Point: 1064°C Color: gold Valence: 7 Ba Barium Physical State (at STP): Solid Density: 3.6 g/cm 3 Hardness (Mohs Scale): 1.25 Conductivity: Good Solubility (H 2 O): reacts strongly Melting Point: 710°C Color: silvery white Valence: 2 Unknown #8 Physical State (at STP): Solid Density: 1.74 g/cm 3 Hardness (Mohs Scale): 2.5 Conductivity: Good Solubility (H 2 O): reacts slowly Melting Point: 651°C Color: silvery white Valence: 2

7. He Helium Physical State (at STP): Gas Density: 0.00018 g/cm 3 Hardness (Mohs Scale): none Conductivity: Very poor Solubility (H 2 O): none Melting Point: -272 °C Color: colorless Valence: 8 Unknown #6 Physical State (at STP): Solid Density: 2.54 g/cm 3 Hardness (Mohs Scale): 1.5 Conductivity: Good Solubility (H 2 O): reacts rapidly Melting Point: 769°C Color: silvery white Valence: 2 Ne Neon Physical State (at STP): Gas Density: 0.00090 g/cm 3 Hardness (Mohs Scale): none Conductivity: Very poor Solubility (H 2 O): none Melting Point: -249°C Color: colorless Valence: 8 Unknown #4 Physical State (at STP): Gas Density: 0.00374 g/cm 3 Hardness (Mohs Scale): none Conductivity: Very poor Solubility (H 2 O): none Melting Point: -156.6°C Color: colorless Valence: 8

8. Ar Argon Physical State (at STP): Gas Density: 0.00178 g/cm 3 Hardness (Mohs Scale): none Conductivity: Very poor Solubility (H 2 O): none Melting Point: -189.2 °C Color: colorless Valence: 8 Xe Xenon Physical State (at STP): Gas Density: 0.00585 g/cm 3 Hardness (Mohs Scale): none Conductivity: Very poor Solubility (H 2 O): none Melting Point: -119.9°C Color: colorless Valence: 8