Elemental Mastery: Ace Our Chemistry Challenge! Which element is the lightest and most abundant in the universe? Hydrogen Helium Oxygen Carbon None What is the chemical symbol for the element known as "Laughing Gas"? N O H N₂O None Which element is essential for the process of photosynthesis in plants? Lead Uranium Chlorine Magnesium None What is the chemical symbol for the noble gas often used in balloons for lifting purposes? Ne Ar He Kr None Which element, found in bones and teeth, is vital for the proper mineralization of skeletal structures? Fluorine Calcium Phosphorus Sodium None Time's up Most Popular Most Popular
