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Period: 500 BCE to
History of an atom
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Period: 500 BCE to
History of an atom
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440 BCE
Democritus discovery
He suggested the world was made up of tiny particles that make up space. He also thought they varied in size and shape. He called them atomos -
400 BCE
Democritus discovery
Democritus developed the concept of the atom. Greek for 'indivisible'. Democritus believed that everything in the universe was made up of atoms, which were microscopic and indestructible. -
John Daltons discovery
John dalton discovered methods to calculate atomic weights and structures and formulated the law of partial pressures. He used Experiments with gases that became possible at the turn of the nineteenth century led John Dalton in 1803 to propose a modern theory of the atom. -
Daltons discovery
John dalton did experiments where common substances broke down into the same elements. He concluded the various compounds were atoms of the elements, each of a particular size and mass that can’t be created or destroyed. One of the main discoveries he found was the Elements have atomic masses. -
J. J Thompson’s discovery
Thompson discovered the electron. He showed that atoms were packed with possible matter, filled with negatively charged electrons. -
Rutherfords discovery
Ernest Rutherford was studying the effects of x rays on gases, he decided to study atoms. He shot small positive charge alph particles at a sheet of gold foil. He found that some paetuckes bounce off of the foil. He discovered atoms are just largely nothing but open space with few electrons. He also found the nucleus -
Bohrs discovery
Niels Bohr thought that electrons circle the nucleus at fixed energies and speeds able to jump from one space to another. But not exist in the place between. He also created the bohrs model.
