The lightest and most abundant chemical substance in the Universe.
Colorless, odorless, tasteless, non-toxic, and inert gas.
A soft, silvery-white alkali metal. The least dense of all solid elements.
A relatively rare element in the universe, often forming into crystals.
Low-abundance element, commonly used in fiberglass and ceramics.
Tetravalent nonmetal. The chemical basis for all known organic life.
Forms about 78% of Earth's atmosphere, making it the most abundant uncombined element.
Highly reactive nonmetal and oxidizing agent. Essential for respiration of most living organisms.
The most electronegative and reactive of all elements. Extremely toxic as a gas.
A colorless, odorless inert gas. Glows with a reddish-orange light when used in high-voltage glow lamps.