-
John Dalton
Dalton noted that oxygen and carbon combined to make two compounds. Of course, each had its own particular weight ratio of oxygen to carbon. but also, for the same amount of carbon, one had exactly twice as much oxygen as the other. This led him to propose the Law of Simple Multiple Proportions -
J.J Thomason
In 1906 Thomson demonstrated that hydrogen had only a single electron per atom. Previous theories allowed various numbers of electrons. -
Ernest Rutherford
He found atoms were mostly empty space with a highly electric field surrounding the nucleus. -
Niels Bohr
Bohr discovered that neutrons and protons occupy a dense central region called a nucleus, and electrons orbit the nucleus. Bohr created a model of atomic structure that showed that electrons traveling around the nucleus of an atom. Bohr improved on Rutherford's idea of an atom and he said that electrons move around the nucleus in restricted orbits and explained how they function. -
Erwin Schrodinger
He suggested that electrons behave in a wave like manner rather than just particles and that their exact location within an orbit couldn't be accurately determined. His view of the atoms is defined as layer upon layer in terms of the electron shell. Each electron shell is made up of a number of sub shells -
Democritas
He found out about everything is composed of actors. That there are an infinite number of atoms, and kinds of atoms, which differ in shape and size. He quote that "The more any indivisible exceeds, the heavier it is."
