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Democritus
Democritus was a Greek philospher who created the name "atoms" for particles. He lived from 460 B.C. to 370 B.C. He also made up a set of laws for which all atoms abide by, such as them being infitinite types in number, always moving, can combine with other atoms, and much more. -
John Dalton
With a time span from 1766 to 1844, John Dalton started his career as a teacher at a Quaker boarding school. Later on in his life, Dalton brought up new ideas about atoms: all matter is made of atoms, all atoms of a given element are identical in mass and properties, and so forth. Dalton also created a model atoms that looked like spheres with each element having it's own size. -
J.J Thomson
J.J Thomson was the first scientist to discover that atoms consisted of smaller subatomic particles. Thomson discovered there were positive and negative particles. He lived from 1856 to 1940 -
Max Planc
Max Planc was a German scientist who is best known as the originator of the quantum theory of energy. He helped alot in our understanding of atomic and subatomic particles. After creating the quantum theory of energy, Albert Einstein used the theory to discover the properties of light! Planc was born in 1858 and died in 1947. -
Ernest Rutherford
Living from 1871 to 1937, Ernest Rutherford make remarkable discoveries contributing to our knowledge of atomic theory. Determining two things, he found out Thomson's atomic model was incorrect.He determined the positive charge was in the center of the atom and most of the arom was nothing but empty space. -
Francis Aston
Inventor of the mass spectograph, Francis Aston was the first person to observe isotopes. He observed there were three different kinds of hydrogen atoms, and much more about different atoms. Rutherford was led to his work by Aston. He was born in 1877 and died in 1945. -
Erwin Schrodinger
Schrodinger was an Australian physicast who took the Bohr atom one step further. He used mathematical equations to describe likelihood of finding an electron in a certain postition. The model he created was called the quantum mechanical model of the atom. He was born in in 1877 and died in 1961. -
Neils Bohr
Bohr was the man to refine Rutherford's model of the atom. Bohr stated that electrons actually orbited around the nucleus without losing even a bit of energy. He also stated electrons could move only in fixed orbits of specific energies. Electrons with low energy would orbit closer to the nucleus which ones with high energy orbit further away. Chadwick was born in 1885 and died in 1962. -
James Chadwick
James Chadwick was a huge contribution to science. He discovered along with protrons and electrons, there was another type of particle called a neutron. He also founded the atomic number being the amount of protrons in an atom. James was born in 1891, and died in 1974. -
Paul Dirac
Paul Dirac was an outstanding scientist who won a nobel prize in physics. Dirac established the groundwork of quantu, field theory. He also utilized his own version of quantum mechanics to help develop the transformation theory. Dirac was born in 1902 and died in 1984.
