# data[].attributes.body
when: 460 B.C
where: Ancient Greece
theory: formulation of an atomic theory of the universe.

# data[].attributes.body
when: 1869
where: Russia
theory: Periodic law. The statement that the chemical and physical properties of the elements recur periodically when the elements are arranged in the order of their atomic weights.

# data[].attributes.body
when: 1897
where: England
theory: Discovered the electron. He demonstrated that cathode rays were negatively charged.

# data[].attributes.body
when: 1803
where: England
theory: All matter was composed of atoms. The first part of his theory states that all matter is made of atoms, which are indivisible.The second part of the theory says all atoms of a given element are identical in mass and properties. The third part says compounds are combinations of two or more different types of atoms. The fourth part of the theory states that a chemical reaction is a rearrangement of atoms.

# data[].attributes.body
when: 1911
where: New Zealand
theory: discovered that atoms have a small charged nucleus surrounded by a large empty space, and has tiny circular electrons spinning around it.

# data[].attributes.body
when: 1913
where: Denmark
theory: electrons travel in separate orbits around the nucleus and that the number of electrons in the outer orbit determines the properties of an element.

# data[].attributes.body
when: 1926
where: Austria
theory: used math equations to describe the likelihood of finding an electron in a certain position.