Hydrogen: Quick Facts - Symbol: H - Atomic Number: 1 - Category: Non-metal - State at Room Temperature: Gas - Molecular Formula: H₂ - Abundance: Most abundant element in the universe - Key Properties: - Colorless, odorless, and tasteless - Highly flammable - Lightest element (density: 0.09 grams per liter) Use: - Fuel cells for clean energy - Potential energy carrier for transportation Environmental Impact: When used as a fuel, hydrogen produces only water as a byproduct, making it a clean energy source. Production Methods: -electrolysis of water -steam reforming of natural gas -biomass gasification