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They developed what was know as the first atomic theory, The Atomic Theory of the Universe, in which they stated the atom as an indivisible and indestructible particle. It called the smallest particle of matter.
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Dalton´s Atomic Theory was the first atomic model based on scientific bases. He included that atoms can combine to create compounds and reinforced that atoms are indivisibles and indestructibles even when they involve in chemical reactions.
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Mendeleev is the creator of the periodic table.HIs period laws states that "physical and chemicals of the elements are periodic functions of their atomic number"
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His theory introduced the presence of two different rays moving inside the atom.
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He represented an atom structure in which included the presence of negatives charge, called electrons, inside a positive atom.
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Ernest Rutherford classified particles and classify them by alfa, beta, and gamma.He also found that the radioactivity was a disintegration of the elements
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Millikan determine the charge value of the electron by an oil experiment
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Chadwick verified that the disintegration of the ratio produces helium.Also showed up that radioactive elements could have more than one atomic weight,despite that their chemical properties are equal
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He described how his atom model was especially the hydrogen one.Is model was a radical departure from earlier,classical description it was the first one that incorporated the quantum model.
