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400 BCE
Democritus
Democritus theory was that atoms cannot be destroyed, differ in size, shape and temperature, they are always moving and are invisible. Democritus atom has infinite number of atoms and it is the first atomic model -
Dalton
The theory proposed that matter was composed of atoms, indivisible and indestructible.
Atomic theory also stated that atoms were identical, had different elements and had atoms of differing size and mass.
The theory says that chemical reactions resulted in the rearrangement of the reading atoms.
His theory was that compounds are formed of two or more different kinds of atoms. -
Discovery Of Thomson Atom
Joseph John Thomson discovered the atom in 1897, His experiment during the experiment of cathode rays tube showed that all of the atoms contain positive a negatively charged particles or electrons. -
Thomson Propose Atom
1904 Thomson proposed his atomic model and hi proposed that atoms were made up of electrons surrounded by a positively charged substances and it balanced the other charges. -
Rutherford-Bohr proposed Model
The Rutherford-Bohr atomic model explained the rydberg formula which was that it would eliminate radiation -
Rutherford Atomic Model
His model consisted if how alpha particles or how positive particles would end up. The atom has a positively charged core called nucleus and it is where all the mass is concetrated. -
Rutherford-Bohr Atomic Model
These atom was considered the primitive compared to valance shell atom. The atom has a positive charged nucleus and it is sorrounded by electrons. -
Quantum Mechanical Model
Based on mathematics, the atom uses different shapes and sizes of the orbitals in which there is likely to be an electron.
It is based on quantum theory which was that matter also has properties associated with waves.What this atom proposed was that all the particles coul be trated as wavelenght -
Errwin Schödinger
Erwin use mathematical equations to discovere this atom, there is a equation that helps you get to the atom but you can predict the odds of the location
