What does CHN mean in CHEMISTRY

Carbon is a non-metallic element that is found in many different forms on Earth. It is the basis of all known organic molecules, including carbohydrates, lipids, proteins, and nucleic acids.

Hydrogen is an odorless and colorless gas that makes up over 75% of the universe's elemental mass. It's the lightest element on the periodic table and it's found in water molecules (H2O) as well as a host of other naturally occurring compounds.

Nitrogen is a colorless and odorless gas that makes up 78% of Earth's atmosphere by volume. It has important roles in both chemical synthesis and biological processes - from helping plants to grow to aiding in respiration and metabolic processes in animals.

These three elements form key components of many essential molecules required for life — from DNA to proteins to hormones. Carbon atoms serve as backbones for much larger organic molecules such as carbohydrates or fats; hydrogen atoms pair off with oxygen or nitrogen atoms to form water or ammonia; while nitrogen combines with hydrogen atoms to form amino acids which ultimately make up proteins.

All three of these elements tend to interact with each other through covalent bonds — either between themselves or with other atoms — forming complex molecules necessary for life as we know it today. All three elements also contribute electrons when forming such bonds which affect the overall stability of these bonds — making them very important parts of biochemistry.