Scientists that contributed to the atomic model

John Dalton

Oct 28, 1803

John Dalton pictures atoms as indestructible particles with no internal structure.

Henri Becquerel

Nov 1, 1896

French physicist who while investigating fluorescence in uranium salts discovered radioactivity that is like x-rays but unlike x-rays could be deflected by a magnetic field so it must consist of charged particles also known as atoms.

J.J. Thomson

Oct 28, 1897

A British scientist discovers the electron leading to his "plum-pudding" model.

Hantaro Nagaoka

Oct 28, 1904

A Japanese physicist suggests that an atom has a central nucleus.

Ernest Rutherford

Oct 28, 1911

New Zealander states that and atom has a dense positively charged nucleus.

Ernest Marsden

Oct 31, 1911

Helped and worked on Ernest Rutherford's atom model.

Neils Bohr

Oct 31, 1913

He applies quantum theory to Rutherford's atomic structure by assuming that electrons travel in stationary orbits defined by their angular momentum.

Louis de Broglie

Oct 31, 1924

He proposed that electrons could behave as waves under some conditions.

Max Planck

Nov 1, 1924

German physicist who formulated an equation describing the blackbody sprectrum and the equation is that energy was directly proportional to frequency. E=hv

Erwin Schrodinger

Oct 31, 1926

He determined how to find the probability for where the electron is in an atom.

James Chadwick

Oct 31, 1932

He first man to discover the neutron-the neutrally charged particle of the nucleus.

Democritus

Mar 2, 2022

Thought everything in the universe is composed of atoms.

Aristotle

Mar 2, 2022

Aristotle developed the theroy that all matter consisted of four elements, earth, air, water and fire.