2. Unknown #1 - Strontium Atomic Number: Atomic Weight: Element Classification: Density: Phase at Room Temperature: Valence Electrons: Reactivity: 38 87.62 Metal 2.64 g / cm 3 Solid 2 High

3. Unknown #2 - Titanium Atomic Number: Atomic Weight: Element Classification: Density: Phase at Room Temperature: Valence Electrons: Reactivity: 22 47.867 Metal 4.5 g / cm 3 Solid 4 Medium

4. Unknown #3 - Zinc Atomic Number: Atomic Weight: Element Classification: Density: Phase at Room Temperature: Valence Electrons: Reactivity: 30 65.409 Metal 7.13 g / cm 3 Solid 2 High

5. Unknown #4 - Phosphorus Atomic Number: Atomic Weight: Element Classification: Density: Phase at Room Temperature: Valence Electrons: Reactivity: 15 30.973762 Non-metal 1.82 g / cm 3 Solid 5 High

6. Unknown #5 - Sulfur Atomic Number: Atomic Weight: Element Classification: Density: Phase at Room Temperature: Valence Electrons: Reactivity: 16 32.065 Non-metal 2.06 g / cm 3 Solid 6 High

7. Unknown #6 - Iodine Atomic Number: Atomic Weight: Element Classification: Density: Phase at Room Temperature: Valence Electrons: Reactivity: 53 126.90447 Non-metal 4.93 g / cm 3 Solid 7 High

8. Unknown #7 - Xenon Atomic Number: Atomic Weight: Element Classification: Density: Phase at Room Temperature: Valence Electrons: Reactivity: 54 131.293 Non-metal 0.005 g / cm 3 Gas 8 Non-Reactive