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Democritus(460-370) B.C
Downey, Ed. "Democritus." Democritus (2006): 1. Science Reference Center. Web. 26 Feb. 2015.He discovereed that underlying atoms of the world can't be destroyed but rearranged and change from one form to another.And the shape of the atom determines how the atom behaves. -
Period: to
Atomic development
Timespand -
John Daltons(1766-1844)
he discoversed that the whole world is made of atoms ,and tiny paricles called elements form elements. His model was represented as a solid circle simular to Democritus -
Thompson (1887)
He discovered the electron by experimenting with a crookes or Cathode ray tub but also proved protonsand electrons were present. -
Bohr(Janurary 1, 1913)
Conclude electrons can have stable orbits around the nucleus.Quantum Theory.Bohr atoms -
Rutherford(1911)
That atoms were made up of a charged nucleus or bited by electrons.Designed an experiment designed an experiment to use the alphaparticlesemitted by a radio active element as probes to the unseen world of atomic structure.Nucleur atom ,planet any model of the atom. -
Heisenburg and Schhrodinger(1925)
He found a way to formulate quantum mechanics in termotmatrices.(Electron don't travel in definite pattern around the nucleus.Schhrodinger used mathematical equations to describe the likehood of finding an electron in a certain position.
