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410
Democritus
The Greek philosopher Democritus had made a hypothesis that If matter were to be divided into smaller and smaller pieces, it would lead to the smallest piece possible which was a tiny indestructible piece which was then named the atom -
410
Aristotle
Aristotle was a greek philosopher who had believed that the earth was made up of only four elements of air, earth, water and fire. Aristotle also felt that no mater how many times you cut matter in half you will alway have a smaller pieces -
Period: 410 to
creation of the atom theory
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Issac Newton
Sir Issac Newton theory stated that all Atoms were pulled together by strong forces He also suggested an "atomic" nature of matter,which a lot of early Greeks had also suggest -
Robert Boyle
Robert Boyle had Helped develop a definition for the atmoic theory and had also helpped by putting an end to the idea of the earth being made up off only four elements -
Antoine Lavoisier
Antoine Lavoisier was the creator of the Combustion Theory which was based on sound mass measurements. He had also named oxygen. and made the Law of Conversation of Mass which is the beginning of modern chemistry. -
Joseph Preiestley
Joseph Preiestley was the discoverer of a key component/element of life,what he had discovered was the gas known as oxygen which he had named "dephlogisticated air -
Dimitri Mendeleev
Dimitri Mendeleev was the first person to create the periodic law and made the first periodic table.he's table was arranged according to increasing atomic weight but unfortunitly he did not have all the elements and left some parts of the table blank. -
John Dalton
John Dalton came up with many different ideas relating to the atom as well as comming up with several element symbols. -
Henry Moseley
Henry Moseley was the person whom had figured out that the Number of protons in an element represents its atomic number. -
Niels Bohr
Niels Bohr suggestted a model of an atom that stated that the outer shell of an atom could hold more electrons than the inner shell. -
James Chadwick
Chadwick discovered the neutrons which are located Inside the nuclues as well as positvely charged particles which are called electrons.this discovery directly led to the discovery of fission and eventually to the atomic bomb.
