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500 BCE
Empedocles
He explained thru his theory that substances are made up of four pure elements = air, fire, water, and earth. The importance of this theory is that it simplifies our world into basic elements . -
400 BCE
Democritus
The Democritus theory consisted of seeing all material bodies formed by atoms. The importance of this theory was it showed us the early formed of the conservation of energy . -
John Dalton
John Dalton created the theory of atomism wich helped us to know the modern concept of an atom . -
JJ Thomson
He discovered that atoms were composed of smaller components. This discovery helped the evolution of how scientists thought about an atom and it helped the development of physics. -
Ernest Rutherford
He discovered the atom's nucleus, this one helped the study of atoms and subatomic particles -
Niels Bohr
Niels Bohr created a model that explained why only atoms emit light of fixed wavelengths. This means that the electrons that are found in an atom can only use a certain allowed energy -
Louis DeBrogile
He introduced the idea of particles and electrons, which could be described as waves and not just like particles. The importance of this theory is that it indicates the length scale at wich wake. like properties are important for the particle. -
Erwin Schrödinger
Schrödinger showed us that the quantization of the hydrogen atoms' energy levels can be calculated. This discover helped to detect where the electron could be at any given moment -
James Chadwick
In 1932 Chadwick bombarded beryllium with alpha particles ( they are composed of 2N and 2P). Unknown radiation was produced, and Chadwick interpreted this radiation as being composed of particles from know on these particles known as a neutron.The discovery of this particle helped the scientist by giving them a tool to probide the properties of atomic nuclei -
Werner Heisenberg
Theory of the atomic nucleus, he develop a model which showed the interaction between a proton and a neutron which is known as a strong force.