Chemistry of life

Lessons
Elements and atoms
Electron shells and orbitals
Chemical bonds and reactions
About this unit
Learn how chemistry makes life possible! From you, to your dog, to your dinner, to the global ecosystem, all living systems are made out of atoms that obey the basic rules of chemistry. Here, you can learn about the key properties of atoms, including what particles they contain, how they are organized, and how they form chemical bonds with one another.