470 BC
380 BC
1736
Robin Dourlens 2nd Nil
Democritus is one of the preceptors of materialistic theory. Democritus first proposed that everything in the world was made up of tiny particles surrounded by empty space. And he even speculated that they vary in size and shape depending on the substance they compose. He called these particles “Atomos”, Greek for indivisible. His ideas were opposed by the most popular philosophers of his day who stating instead that matter was made of four elements: earth, wind, water and fire.
In 1789, Coulomb continued his research on magnetism, friction and electricity. He discovered that two opposing charges attract each other. In 1757, he invented the torsion balance, which allowed the force of magnetic and electrical attraction to be measured. He later stated Coulomb's Law, which governs the interaction of electrical charges. Its name has been given to a unit to express the amount of electrical charge: the Coulomb.
Charles Augustin de Coulomb
Democritus
Atomic Theory Timeline
John Dalton
1766
1844
1806
English chemist and physicist. He published, in 1808, five atomic laws which are: -All matter is composed of extremely small spherical indivisible particles called atoms. Then, elements combine to form chemical compounds and that in chemical reactions atoms are combined separated or rearranged. Dalton showed that common substances always broke down into the same elements in the same proportions. He concluded that the various compounds were combinations of atoms of different elements, each of a particular size and mass, that could neither be created nor destroyed. Then, he received many honors for his work.
Physicist who in 1897 discovered the electron. In what we might call the chocolate chip cookie model of the atom, he showed atoms as uniformly packed spheres of positive matter filled with negatively charged electrons. Thomson won a Nobel Prize in 1906 for his electron discovery, but his model of the atom didn’t stick around long.
J.J Thomson
1871
1937
Rutherford is known as the father of the nuclear age. He decided to investigate atoms more closely by shooting small, positively charged alpha particles at a sheet of gold foil. Under Thomson’s model, the atom’s thinly dispersed positive charge would not be enough to deflect the particles in any one place. The effect would have been like a bunch of tennis balls punching through a thin paper screen. But while most of the particles did pass through, some bounced right back, suggesting that the foil was more like a thick net with a very large mesh. Rutherford concluded that atoms consisted largely of empty space with just a few electrons, while most of the mass was concentrated in the centre, which he termed the nucleus. The alpha particles passed through the gaps but bounced back from the dense, positively charged nucleus.
1962
Niels Bohr
1885
In 1913, Niels Bohr expanded on Rutherford’s nuclear model. He affirmed that electrons orbit the nucleus at fixed energies and distances, able to jump from one level to another, but not to exist in the space between. He added that electrons move simultaneously behaved like waves, not being confined to a particular point in space.
Rutherford
Atomic Theory Timeline
1961
1901
1887
Werner Heisenburg
Erwin Schrödinger
He showed with the “uncertainly principle” that it was impossible to determine both the exact position and speed of electrons as they moved around an atom. He received a Nobel Prize in 1932.
Austrian physicist Erwin Schrödinger is one of the founders of quantum mechanics, but he’s most famous for something he never actually did: a thought experiment involving a cat. He imagined the equation of evolution of the wave function associated with the state of a particle, he allowed the development of the theoretical formalism of quantum mechanics.
Chadwick
Britain physicist who has discovered the neutron in 1932 and received thereafter a Nobel prize in 1935. This discovery end in nuclear fission and, therefore, the atomic bomb…
1974
1891
1976
Atomic Theory Timeline
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Transcript
470 BC
380 BC
1736
Robin Dourlens 2nd Nil
Democritus is one of the preceptors of materialistic theory. Democritus first proposed that everything in the world was made up of tiny particles surrounded by empty space. And he even speculated that they vary in size and shape depending on the substance they compose. He called these particles “Atomos”, Greek for indivisible. His ideas were opposed by the most popular philosophers of his day who stating instead that matter was made of four elements: earth, wind, water and fire.
In 1789, Coulomb continued his research on magnetism, friction and electricity. He discovered that two opposing charges attract each other. In 1757, he invented the torsion balance, which allowed the force of magnetic and electrical attraction to be measured. He later stated Coulomb's Law, which governs the interaction of electrical charges. Its name has been given to a unit to express the amount of electrical charge: the Coulomb.
Charles Augustin de Coulomb
Democritus
Atomic Theory Timeline
John Dalton
1766
1844
1806
English chemist and physicist. He published, in 1808, five atomic laws which are: -All matter is composed of extremely small spherical indivisible particles called atoms. Then, elements combine to form chemical compounds and that in chemical reactions atoms are combined separated or rearranged. Dalton showed that common substances always broke down into the same elements in the same proportions. He concluded that the various compounds were combinations of atoms of different elements, each of a particular size and mass, that could neither be created nor destroyed. Then, he received many honors for his work.
Physicist who in 1897 discovered the electron. In what we might call the chocolate chip cookie model of the atom, he showed atoms as uniformly packed spheres of positive matter filled with negatively charged electrons. Thomson won a Nobel Prize in 1906 for his electron discovery, but his model of the atom didn’t stick around long.
J.J Thomson
1871
1937
Rutherford is known as the father of the nuclear age. He decided to investigate atoms more closely by shooting small, positively charged alpha particles at a sheet of gold foil. Under Thomson’s model, the atom’s thinly dispersed positive charge would not be enough to deflect the particles in any one place. The effect would have been like a bunch of tennis balls punching through a thin paper screen. But while most of the particles did pass through, some bounced right back, suggesting that the foil was more like a thick net with a very large mesh. Rutherford concluded that atoms consisted largely of empty space with just a few electrons, while most of the mass was concentrated in the centre, which he termed the nucleus. The alpha particles passed through the gaps but bounced back from the dense, positively charged nucleus.
1962
Niels Bohr
1885
In 1913, Niels Bohr expanded on Rutherford’s nuclear model. He affirmed that electrons orbit the nucleus at fixed energies and distances, able to jump from one level to another, but not to exist in the space between. He added that electrons move simultaneously behaved like waves, not being confined to a particular point in space.
Rutherford
Atomic Theory Timeline
1961
1901
1887
Werner Heisenburg
Erwin Schrödinger
He showed with the “uncertainly principle” that it was impossible to determine both the exact position and speed of electrons as they moved around an atom. He received a Nobel Prize in 1932.
Austrian physicist Erwin Schrödinger is one of the founders of quantum mechanics, but he’s most famous for something he never actually did: a thought experiment involving a cat. He imagined the equation of evolution of the wave function associated with the state of a particle, he allowed the development of the theoretical formalism of quantum mechanics.
Chadwick
Britain physicist who has discovered the neutron in 1932 and received thereafter a Nobel prize in 1935. This discovery end in nuclear fission and, therefore, the atomic bomb…
1974
1891
1976