-
400
Democritus
Around 400 BC Democritus, matter is made up of small invible particles , that come in different forms positions and arrangements. -
Mechanical Universe
Isaac Newton theorized a mechanical universe with small, solid masses in motion. -
Hydrogen
In 1766 Henry Cavendish discovers and studies hydrogen. -
Periodic table
Antoine Lavoisier published the first Peroidic table , with 33 chemical elements , although they were devided into gases nonmetals , metals and "earths" -
Dalton's laws
John Dalton proposes an "atomic theory" with spherical atoms based upon measurable mass -
First cathode ray tube
J.Plucker Builds the first cathode ray tube , which is later instrumental in future nuclear research . -
Dmitri Mendeleev's Periodic table
Dmitri Mendeleev Periodic table included gaps were elements which had not been discovered , but had to exist would be , it also has rows and tables similar to current ones.His table also did not order them by atomic weight , but actually atomic number , even though atomic numbers had not been devised at the time. -
X-Rays
X-rays are discovered by german physicist Wilhelm Rontgen, he conducts numerous tests and expirments with his new discovery -
Radium and polonium
In 1898 Pierre and Marie Curie discover the first radioactive elements: radium and polonium -
Beta & Alpha waves
Ernest Rutherford publishes discoveries on radiation, including alpha and beta particles -
Half-lifes& Isotopes
Frederick Soddy disovers unstable Isotopes , and that some of them have half-lives , and can decay. -
Noble gas stability
Richard Abegg discoveres that Noble gasses are stable because of their electron configurations -
Gieger Counter
In 1906 Hans Gieger invents the first primitive Gieger counter , which later on can be used to detect radation , radioactive ores , and many other types of radioactive oddities. -
Bohr Model
Niels Bohr proposed an atomic structure theory that stated the outer orbit of an atom could hold more electrons than the inner orbit. -
Neutrons discovered
James Chadwick discovered neutrons, a subatomic unit which has a neutral charge and weights slightly more then a proton , and s located inside the nucleus.
