Atomic TheoryAtomic Theory

Brittany RigsbeeBrittany Rigsbee

9-19-119-19-11

Democritus Theory Democritus Theory In 1417 was when In 1417 was when

Democritus Theory was Democritus Theory was discover. The atoms in discover. The atoms in Democritus theory Democritus theory remain the same but remain the same but move about in space move about in space and combine in various and combine in various ways to form all ways to form all macroscopic objects. macroscopic objects. Early atomic theory Early atomic theory stated that the stated that the characteristics of an characteristics of an object are determined object are determined by the shape of its by the shape of its atoms. atoms.

Dalton Dalton It was in the early 1800s It was in the early 1800s

that John Dalton, an that John Dalton, an observer of weather and observer of weather and discoverer of color discoverer of color blindness among other blindness among other things, came up with his things, came up with his atomic theory. Less than atomic theory. Less than twenty years ago in the twenty years ago in the 1780's, Lavoisier ushered 1780's, Lavoisier ushered in a new chemical era by in a new chemical era by making carefulmaking careful measurement which measurement which allowed the compositions allowed the compositions of compounds to be of compounds to be determined with accuracy.  determined with accuracy. 

Thomson Thomson

Thomson created Thomson created electrons in 1897. He electrons in 1897. He also was the Noble Prize also was the Noble Prize Winner. His experiments Winner. His experiments suggested not only that suggested not only that cathode rays were over cathode rays were over 1000 times lighter than 1000 times lighter than the hydrogen atom, but the hydrogen atom, but also that their mass was also that their mass was the same whatever type the same whatever type of atom they came of atom they came from. from.

Millikan Millikan

Millikan was a Millikan was a experimental experimental physicist. His physicist. His measurements was measurements was to change the to change the electrons to see if electrons to see if it was going to it was going to work more effetely. work more effetely.

RutherfordRutherford

Rutherford Rutherford discovered the discovered the concept of concept of radioactive. He radioactive. He kind of like kind of like Thomson but the Thomson but the only thing that only thing that Rutherford did he Rutherford did he jut wanted to prove jut wanted to prove it.it.

Chadwick Chadwick

In 1932 Chadwick In 1932 Chadwick discovered discovered neutrons. Because neutrons. Because of the lack of of the lack of electric. He wanted electric. He wanted see the likes to the see the likes to the repel and opposite repel and opposite to the attract. By to the attract. By him doing this he him doing this he got award. got award.

Bohr Bohr

The Bohr Theory The Bohr Theory came up in 1913. came up in 1913. How the electrons How the electrons move in the solar move in the solar system. He also system. He also was a Noble Prize was a Noble Prize Winner. He wanted Winner. He wanted to contributions to to contributions to understanding understanding atomic structure.atomic structure.

Quantum Mech. ModelQuantum Mech. Model

This theory was This theory was developed in 1925 developed in 1925 by Werner by Werner Heisenberg. This Heisenberg. This theory is providing theory is providing a mathematical a mathematical description of the description of the waves particle. waves particle.