The Division of Adolescent Medicine provides primary and consultation services for adolescents and young adults between 12 and 21 years of age. We have a separate waiting room and examination area for these patients and offer services tailored to their needs and health care issues.
Modern atomic theory is generally said to begin with John Dalton, an English chemist and meteorologist who in 1808 published a book on the atmosphere and the behavior of gases that was entitled A New System of Chemical Philosophy.
Definition. 1  Greek Philosopher. 2  1st person to propose the idea that matter was not infinitely divisible. 3  He believed that matter was made up of tiny individual particles called atomos, from which the English word atom was derived.  He believed that atomos could not be created, destroyed or further divided.