# data[].attributes.body
In 1992, Niels Bohr proposed an atomic structure theory, stating that the outer orbit of an atom held more than the inner orbit.

# data[].attributes.body
In 1898, Ernest Rutherford discovered alpha, beta, and gamma rays in radiation.

# data[].attributes.body
In 1932, Chadwick discovered neutrons, particles whose mass was close to that of a proton.

# data[].attributes.body
In 1898, Curie discovered radium and polonium and coined the term radioactivity after studying the decay process of uranium and thorium.

# data[].attributes.body
Thomson determined the charge to mass ratio of electrons. He discovered electrons in 1897.

# data[].attributes.body
In 1803, John Dalton suggested that elements were made up of atoms that were identical and had the same mass. Moreover, he proposed that compounds were atoms from different elements that were combined together.

# data[].attributes.body
In 422 BC Democritus developed the idea that all matter is made up of small indestructible units, called atoms.

# data[].attributes.headline
Democritus, Dalton, thomson, rutherford, curie, bohr, chadwick

# data[].attributes.subject
Democritus, Dalton, thomson, rutherford, curie, bohr, chadwick