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  2. Democritus - Wikipedia

    en.wikipedia.org/wiki/Democritus

    Democritus (/ d ɪ ˈ m ɒ k r ɪ t ə s /, dim-OCK-rit-əs; Greek: Δημόκριτος, Dēmókritos, meaning "chosen of the people"; c. 460 – c. 370 BC) was an Ancient Greek pre-Socratic philosopher from Abdera, primarily remembered today for his formulation of an atomic theory of the universe. [2] Democritus wrote extensively on a wide ...

  3. History of atomic theory - Wikipedia

    en.wikipedia.org/wiki/History_of_atomic_theory

    Rutherford defined this position as being the element's atomic number. [75] [76] [77] In 1913, Henry Moseley measured the X-ray emissions of all the elements on the periodic table and found that the frequency of the X-ray emissions was a mathematical function of the element's atomic number and the charge of a hydrogen nucleus (see Moseley's law).

  4. List of people considered father or mother of a scientific field

    en.wikipedia.org/wiki/List_of_people_considered...

    Atomic theory (early) Democritus (c. 460 – c. 370 BC) [62] Founder of atomism in cosmology. Atomic theory (modern) Father Roger Boscovich (1711–1787) [63] First coherent description of atomic theory. John Dalton (1766–1844) [64] First scientific description of the atom as a building block for more complex structures. Atomic bomb

  5. Atomism - Wikipedia

    en.wikipedia.org/wiki/Atomism

    The work of Democritus survives only in secondhand reports, some of which are unreliable or conflicting. Much of the best evidence of Democritus' theory of atomism is reported by Aristotle (384–322 BCE) in his discussions of Democritus' and Plato's contrasting views on the types of indivisibles composing the natural world. [16]

  6. Discovery of chemical elements - Wikipedia

    en.wikipedia.org/wiki/Discovery_of_chemical_elements

    [169] [170] Hafnium was the last stable element to be discovered (noting however the difficulties regarding the discovery of rhenium). 43 Technetium: 1937 C. Perrier and E. Segrè: 1937 C. Perrier & E. Segrè The two discovered a new element in a molybdenum sample that was used in a cyclotron, the first element to be discovered by synthesis. It ...

  7. History of molecular theory - Wikipedia

    en.wikipedia.org/wiki/History_of_molecular_theory

    With the rise of scholasticism and the decline of the Roman Empire, the atomic theory was abandoned for many ages in favor of the various four element theories and later alchemical theories. The 17th century, however, saw a resurgence in the atomic theory primarily through the works of Gassendi, and Newton.

  8. Leucippus - Wikipedia

    en.wikipedia.org/wiki/Leucippus

    Leucippus's philosophy was conjecture based on a priori evidence, while modern atomic theory is supported by empirical evidence found through the scientific method. [ 77 ] [ 78 ] The main practical difference between Leucippus's atomism and modern atomic theory is the introduction of non-tangible phenomena such as mass–energy equivalence and ...

  9. Timeline of atomic and subatomic physics - Wikipedia

    en.wikipedia.org/wiki/Timeline_of_atomic_and...

    1906 Charles Barkla discovers that each element has a characteristic X-ray and that the degree of penetration of these X-rays is related to the atomic weight of the element; 1908-1911 Jean Perrin proves the existence of atoms and molecules with experimental work to test Einstein's theoretical explanation of Brownian motion