-
Period: 300 to
Atoms
-
460
Democritus and the Atom
Democritus was born in Greece in the year 460 B.C. He discovered the atomic theory from his mentor, known as Leucippus, who said, "The universe is composed of two elements: the atoms and the void in which they exist and move.” His discovery was found in 400B.C. -
Dalton and the Atom
The most important of all Dalton's investigations are those concerned with the atomic theory in chemistry. Here he says:
Why does not water admit its bulk of every kind of gas alike? This question I have duly considered, and though I am not able to satisfy myself completely I am nearly persuaded that the circumstance depends on the weight and number of the ultimate particles of the several gases. His discovery was in 1832. -
Thomson and the Atom
He discovered the particles in an atom known as the electron; He used cathode rays to discover electrons in an atom; Thomson thought that the atom had a nucleus and electrons, no protons, no neutrons, but electrons. His discovery was found in 1897. -
Rutherford and the Atom
He discovered that an atom has a nuclues. He used the famous Geiger-Marsden experiment to do this. his atomic model looked like a planrtary system. his discovery was found in 1911. -
Bohr and the Atom
He discovered the atom the same way -
Schrodinger and the Atom
In the first years of his career Schrödinger became acquainted with the ideas of quantum theory, developed in the works of Max Planck, Albert Einstein, Niels Bohr, Arnold Sommerfeld, and others. This knowledge helped him work on some problems in theoretical physics, but the Austrian scientist at the time was not yet ready to part with the traditional methods of classical physics. -
Heisenberg and the Atom
Heisenberg's contribution to the atomic theory was that he calculated the behavior of electrons, and subatomic particles that also make up an atom. Instead of focusing mainly on scientific terms, this idea brought mathematics more into understanding the patterns of an atom's electrons. Heisenberg's discovery helped clarify the modern view of the atom because scientists can compare the actually few numbers of atoms there are, by their movements of electrons, and how many electrons an atom contain
