Volatile elements/species such as water, carbon, nitrogen, noble gases, play a fundamental role in the condensation of solids, in the accretion of planets, and in the formation of their atmospheres. Through the analysis of terrestrial samples, meteorites and recent space missions, we have gained insights into the origin and evolution of nebular gases, asteroids, comets and differentiated bodies. This school will discuss recent advances in our understanding of the solar system and be at the frontier between planetary sciences, astronomy and cosmochemistry.