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John Dalton
British chemist and physicist who owes the first modern formulation of atomic theory. Already recognized as a scientist and with a solid academic position, Dalton discovered the so-called "law of multiple proportions", which governs the weight of the elements that intervene in a chemical reaction, and proposed as its interpretation a whole theory on the constitution of the reaction. -
The first transuranic artificial element
Neptunium was the first transuranic artificial element (after Uranium) of the actinide series.
It was discovered by McMillan and Abelson in Berkeley. -
Interest in the Atom
People started wordering what was inside the Atom and its properties. -
Tube with electricity beam
The tubes were fundamental in scientific research.
They decided to apply electricity to the metal at its end. This maked them wonder what was behind. They then realized that electricity was made up of negatively-charged particles. Then called "electrons". -
Jhon Dalton's theory
Jhon Dalton with his theory that matter is composed of atoms of different masses that combine in simple proportions to form compounds. This theory, first formulated by Dalton in 1803, is the cornerstone of modern physical science. -
JJ.Thomsom
Joseph John Thomson was a British physicist.
Thomson studied the properties of cathode rays and showed that electric fields can deflect them. He conducted many experiments on their deflection under the combined action of electric and magnetic fields, looking for the relationship between charge and particle mass. Even if the cathode material was changed, the ratio remained constant. -
Rutherford
Ernest Rutherford was born on August 30, 1871, in Nelson, New Zeland.
After graduating in 1893, in Christchurch, he moved to Cambridge University to work as an assistant to JJ.Thomsom.
Ernest Rutherford's work in the field of atomic physics is considered one of the founders of the discipline. He studied the radioactive emissions discovered by H. And managed to classify them as alpha, beta and gamma rays. -
Niels Bohr
Niels Henrik David Bohr was a Danish physicist who contributed to the understanding of the atom and quantum mechanics.
Niels Bohr studied physics at the University of Copenhagen, where he obtained his doctorate in 1911.
For him the notion of quantum of action introduced by Planck, made it possible to explain both the stability of the atom and its properties of emission and absorption of radiation. -
Henry Moseley
Henry Gwyn Jeffreys Moseley was an English physicist and chemist. His main contribution to science was the quantitative justification of the concept of atomic number by Moseley's Law.
In 1913 he discovered his law of atomic numbers, according to which the square root of the frequency of the X-rays produced when an element is bombarded with cathode rays is proportional to the atomic number of the element. -
Radioactivity
A French scientist Antoine Henri Becquerel discovered radioactivity almost accidentally while studying the fluorescence of diuranium potassium sulfate. -
Discovery of the electron
JJ.Thomsom announced his descovery of the electron. He discover it by using a cathode ray tubes showed that all atoms contain small negatively charged subatomic particles, called electrons.
Because of this he recieved 1906 Nobel Prize in physics. -
The Atomic Nucleus
The existence of the atomic nucleus was deduced from Rutherford's experiment in 1911, where a thin sheet of gold was bombarded with alpha particles, which are helium atomic nuclei emitted by radioactive rocks.
