Democritus

Theory:

atomic theory, the universe and all matter obey the following 

principles:

Everything is composed of “atoms”, which are physically, but not geometrically, indivisible

Between atoms, there lies empty space

Atoms are indestructible

Atoms have always been, and always will be, in motion

There are an infinite number of atoms, and kinds of atoms, which differ in shape, and size.

Facts about him :

Democritus died at the age of ninety, which would place his death at around 370 BCE; though some writers disagree, with some claiming he lived to 104 or even 109.

credited as being one of the founders of the modern science because his methods and theories closely resemble those of modern astronomers and physicists

Ernest Rutherford

Theory

Atoms are in every living thing, and with information like this, and information that can be gained in the future, we can learn more about our small part in the universe

Thanks to the discovery, we now know that the only "solid" part of the atom is the atomic nucleus, which disproves the plum pudding model

Fact:

In 1894, he was awarded an 1851 Exhibition Science Scholarship, enabling him to go to Trinity College, Cambridge, as a research student at the Cavendish Laboratory under J.J. Thomson.

Erwin Schrodinger 

Theory:

Schrodinger discovered that electrons don't move in orbits (or in a set path at all). He theorizes electrons move in waves, and they have no exact location.


Fact:

Schrödinger used mathematical equations to describe the likelihood of finding an electron in a certain position. This atomic model is known as the quantum mechanical model of the atom. Unlike the Bohr model, the quantum mechanical model does not define the exact path of an electron, but rather, predicts the odds of the location of the electron.

James Chadwick 

Theory:

James Chadwick's Atomic Theory led to the discovery of neutrons. In it, he bombarded a sheet of beryllium with high energy of particles. Other particles came loose, namely the neutron of the atom. 

JJ Thomson 

Thomson's Experiment

On Thomson first experiment try he had an inkling that the ‘rays’ emitted from the electron gun were inseparable from the latent charge, and decided to try and prove this by using a magnetic field. During the second tried he proved that the rays carried a negative charge. Lastly during the last try he shows how a series of experiments can gradually uncover truths.

John Dalton 

 Dalton's Atomic Theory

1) All matter is made of atoms. Atoms are indivisible and indestructible.

2) All atoms of a given element are identical in mass and properties

3) Compounds are formed by a combination of two or more different kinds of atoms.

4) A chemical reaction is a rearrangement of atoms.

Neils Bohr 

He expanded on Rutherford’s ideas, turning his attention to describing the electron. He stated they moved in fixed, circular orbits (or energy levels) around the nucleus, these called electron shells.He identified that an electron can jump from a lower orbit to a higher orbit by absorbing energy, this can be done in the forms of heat, light or electricity. These electrons then lose energy when they are allowed to cool, giving them the emission spectra for all different elements.

Robert Millikan

determined the size of the charge on an electron. He also determined that there was a smallest 'unit' charge, or that charge is 'quantized'.

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Public - 9/24/16, 3:09 AM