- 460 BC - 370 BC, Greece
- Stated that everything possible is made up of "atoms", whose shapes contributed to the solidness of the material.
- "Mental experiments". Used concepts "full" and "empty" to describe the atomic theory.
- Wrote many works, has institutes named after him.
- 1743 - 1794, France
- Came up with the Law of Conservation of Mass.
- Experimented with oxygen.
- Called "Father of Modern Chemistry".
- 1871 – 1937, New Zealand
- The atom has a central positive nucleus surrounded by negative orbiting electrons.
- Experiment involved the firing of radioactive particles through minutely thin metal foils (notably gold) and detecting them using screens coated with zinc sulfide (a scintillator).
- Considered father of nuclear physics.
- 1885 – 1962, Denmark
- Discovered that the outer orbit of an atom could hold more electrons than the inner orbit.
- Made liquid-drop model of nucleus.
- Also contributed to the old Ouantam Theory.
- 1868- 1963, Iowa
- Made an accurate determination of the charge carried by an electron, demonstrated the atomic structure of electricity.
- Oil-drop experiments
- Was a great and well-known author.
- 1887 – 1961, Austria
- Developed equation which can predict the properties and reactivities of atoms.
- Combined the equations for the behavior of waves with another equation to generate a mathematical model for the distribution of electrons in an atom.
- Suffered from Tuberculosis.
- 1766 – 1844, England
- Decided that atoms are a fundamental, chemical object and came up with an atomic theory which consisted of five main points.
- Used atomic weights to demonstrate his theories.
- Called “The Father of Modern Atomic Theory”.
- 1891 - 1974, England
- Discovered neutrons.
- Smashed alpha particles into beryllium and allowed the radiation to collide with parafen wax, which released neutrons.
- He was elected a Fellow of the Royal Society in 1927.
- 1856 – 1940, United Kingdom
- Discovered the electron and studied positively charged particles.
- Constructed the Plum Pudding Model of the atom.
- Awarded the Nobel Peace Prize in 1906 for his work.
- 1858 – 1947, Germany
- Proposed Quantam Theory.
- Used alpha particles as atomic bullets.
- Applied his research to the medical field.
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