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Atomic Theory Timeline
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Published on Nov 21, 2015
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PRESENTATION OUTLINE
1.
ATOMIC THEORY TIMELINE
2.
DEMOCRITUS' CONTRIBUTIONS
Greek Philosopher
First philosopher credited towards the progression of atomic theory
He was the first to name the atom, the atom
3.
DEMOCRITUS' THEORY
The atom is the smallest particle
Nothing exists except atoms and empty space
4.
DALTONS THEORY
Each element is composed of tiny indestructable particles called atoms
(Tiny, hard indivisible spheres)
All atoms if an element are identical
They have the same mass, volume, and other physical properties
Atoms combine in small whole number ratios to firm molecules of compounds
5.
J.J THOMPSON'S CONTRIBUTIONS
Credited with the discovery of the electron
6.
J.J THOMPSON THEORY
Found that the atom is breakable
The atoms structure has electrons suspended in a positivly charged field
It must have a positive charge to balance out the negative charge
7.
THOMPSONS EXPERIMENT
A cathode ray with a positive and negative side
Two plates on the outside- positive and negative
The beam was angled to the positive side
This suggest that there is a negative charge
8.
RUTHERFORD'S EXPERIMENT
Shot a alpha particle through gold foil
Most of the particles went straight through
Some particles bent
Only few bounced back
9.
RUTHERFORD'S THEORY
The atom contains a tiny dense positive center called the nucleus
The nucleus is the entire mass if the atom
The electrons are dispersed in the space surrounding the nucleus
Discovered the proton and thr neutron
Proton has a positive charge- neutron has no charge
10.
BOHR'S THEORY
Electrons travel around the nucleus in orbitals
Every orbital has its number of subshells
Each subshell can hold 2 electrons
The further the electron, the more energy it has
Moving up- excited state- moving down- ground state
11.
SCHRODINGER'S ATOMIC THEORY
Developed an equation that predicts the probability of finding an electron
With a particular amount if energy at a particular location in an atom
Discovered the orbital
EAch orbital can hold 1,2,3, or 4 subshells
These are s,p,d, and f
Roman Danielzadeh
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