1. History Of Atoms
By: Dana Zahra 7D

2. Atoms
Atoms are the building block of all matter and are the simplest form of molecule. They are all made up of protons, neutrons and electrons. They look something like this:
The nucleus:
This contains neutrons and protons.
Electrons:
These orbit around the nucleus

3. The ideas of the structure of the atom changed over time.
Timeline
The ideas of the structure of the atom changed over time.

4. Democritus BC
450BC
One of the first scientists to study the Atom, he thought that all atoms are made of small indestructible particles, and that there are an many atoms and are all in different shapes and sizes.

5. 1803 AD
He found out that different elements have different atoms and that all atoms of the same element are identical.
John Dalton AD

6. Eugene Goldstein
1886 AD
He discovered the existence of the proton and the positively charged particles.

7. Joseph John Thomson 1856-1940 1897 AD
Joseph Thomson discovered the electron. He also invented the Plum-Pudding model, in his model electrons and protons are mixed together.

8. 1905 AD
Einstein found out the light was an amount of energy called photons.
Albert Einstein )

9. Robert Millikan
1909 AD
Robert found out the actual charge and weight of an Electron.

10. Ernest Rutherford
1911 AD
In his Gold-Foil experiment he discovered that the atom was mostly empty but had a solid center that is the nucleus.

11. Niels Bohr
1913 AD
Bohr discovered that electrons are found in circular paths called orbits which move around the nucleus.

12. Louis de Broglie 1892–1987
1923 AD
He found out an equation which shows that particles of matter sometimes behave as waves.

13. Erwin Schrödinger
1926 AD
He invented an equation which could describe energy waves.

14. 1932 AD
He discovered the other part of a nucleus of an atom that has no electrical charge called the neutron.
James Chadwick

15. The ideas of the structure of the atom have changed over time since the technology and sources have improved and also by taking another idea of someone else and improving and building on it.

16. Bibliography: