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460 BCE
Democritus was born
He was born and lived in the Greek city of Abdera. -
370 BCE
Democritus died
In his lifetime:
-He and his mentor, Leucippus are credited for creating the first atomic theory.His theory was based on pure assumptions but was still influential to other scientist.
-Atomos is what he called the small particles of matter. -
Antoine Lavoisier
He was born in Paris, France -
John Daton
John Dalton was born on Eaglesfield, Cumberland, England in 1766 -
Lavoisier discovered that mass remains the same
The Mass remains the same in different forms. -
Antoine Lavoisier said that mass is neither made or destroyed
He explained the nature of Combustion -
Antoine Lavoisier
He named elements of Oxygen and Hydrogen -
Antoine Lavoisier published a chemistry textbook.
The textbook is called "Elementary Treatise on Chemistry" -
Antoine Lavoisier
Antoine Lavoisier died by the guillotine at the age of 50 -
Dalton experiment
Experiments with gases that first became possible at the turn or the nineteenth century led John Dalton in 1803 to propose a modern theory of atoms -
Atomic theory
-Dalton made his discoveries by observing and analyzing gases
-Law of multiple proportions -
Dalton's Public life
In 1810, Sir Humphry Davy asked him to offer himself as a candidate for the fellowship of the Royal Society, but Dalton declined, possibly for financial reasons. However, in 1822 he was proposed without his knowledge, and on election paid the usual fee -
Dalton contributed ...
He contributed 117 Memoirs of the Literary and Philosophical Society of Manchester, from 1817 until his death in 1840, while president of that organization. Of these the earlier are the most important. In one of them, read in 1814, he explains the principles of volumetric analysis, in which he was one of the earliest workers. -
Dalton's dead
He died on July 27, 1844 at the age of 77, in Manchester, England -
J.J Thomson was born
Born in manchester, United Kingdom -
Rutherford was born
Ernest Rutherford was born on this date. -
J.J. Thomsom became Cavendish
He was named to the prestigious Cavendish Professorship of Experimental Physics at Cambridge, -
Niels Bohr was born
Born in Copenhagen, Denmark
He was the first to involve the quantum theory to the atomic and molecular structure. -
Erwin Schrödinger was born
He was born in Vienna,Austria -
James Chadwick
He was born on 20 October 1891, Bollington, Cheshire, England -
J.J Thomson discovered electron.
He performed Cathode Ray experiment -
Rutherford discovers two types of rays.
Ernest Rutherford discovered rays from radioactive materials, which he named Alpha and Beta. (No exact month or date) -
Werner Heisenberg
Werner Karl Heisenberg was born on 5 December, 1901, Würzburg, Bavaria, German Empire -
Ernest Rutherford announces his progress in radioactivity
Ernest Rutherford announces that radioactivity is a manifestation of sub-atomic change. (No exact month and date) -
Plum pudding model
Thomson had discovered that atoms are made of pieces with positive and negative charge, and that the negatively charged electrons within the atom were very small compared to the entire atom. -
J.J. Thomson won the Nobel prize
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Chadwick and Rutherford
Chadwick graduated from the Victoria University of Manchester in 1911, where he studied under Ernest Rutherford (known as the "father of nuclear physics"). -
Ernest Rutherford
He discovered the nucleus of the atom by shooting alpha particles at the gold foil. He discovered high concentration of particles in the center of the atom which is called nucleus. Nucleus has postive charges -
Rutherford announces a model
Ernest Rutherford announces the nuclear model of the atom. -
Bohr's Model
1913 he presented Bohr's Model which suggested that the electrons orbited around the nucleus in a direct pattern. -
J.J. Thomson discovered isotopes
-
Rutherford becomes the first alchemist
Ernest Rutherford changed Nitrogen to Oxygen; he split the atoms. (No exact month and date) -
Rutherford discovers Protons
Ernest Rutherford discovers protons in the year 1918. (No exact month and date) -
Bohr receives Nobel Prize
Bohr was awarded the Nobel Prize for Physics -
Erwin Schrodinger
He discovered an equation that predicts probility of finding the electron. This equation led to the Quantum mechanical model. He also discovvered that nucleus contains protons and neutrons and there's electron cloud that schows the probable location of electons in an atom -
Uncertainity Principle
Heinsenberg pointed out the Uncertainity principle that said that it is impossible to know bith the exact posotion and the exact momentum o an electron at the same time -
Uncertainty principle
Introduced first in 1927, by the German physicist Werner Heisenberg, it states that the more precisely the position of some particle is determined, the less precisely its momentum can be known, and vice versa. -
Chadwick's experiment
In 1932, James Chadwick bombarded beryllium atoms with alpha particles. An unknown radiation was produced. Chadwick interpreted this radiation as being composed of particles with a neutral electrical charge and the approximate mass of a proton. This particle became known as the neutron -
Chadwick discovery
He discovered the neutron -
Nobel Prize for Heinsenberg
Heisenberg was awarded the Nobel Prize in Physics for 1932 "for the creation of quantum mechanics". -
Erwin Schrödinger is awarded Nobel Prize
He received the Nobel Prize in Physics and shared it with Paul Adrien Maurice Dirac. -
Rutherford died
Ernest Rutherford died at the age of 66. -
Atomic bomb
In October 1939, Chadwick received a letter from Sir Edward Appleton, the Secretary of the Department of Scientific and Industrial Research, asking for his opinion on the feasibility of an atomic bomb. Chadwick responded cautiously. He did not dismiss the possibility, but carefully went over the many theoretical and practical difficulties involved. -
J.J Thomson died
-
Other Chadwick's contributions
In 1948, Chadwick accepted an offer to become the Master of Gonville and Caius College. The job was prestigious but ill-defined; the Master was the titular head of the College, but authority actually resided in a council of 13 fellows, of whom one was the Master. As Master, Chadwick strove to improve the academic reputation of the college. He increased the number of research fellowships from 31 to 49, and sought to bring talent into the college. -
Some Heisenberg contributions
He also made important contributions to the theories of the hydrodynamics of turbulent flows, the atomic nucleus, ferromagnetism, cosmic rays, and subatomic particles, and he was instrumental in planning the first West German nuclear reactor at Karlsruhe, together with a research reactor in Munich, in 1957. -
Erwin Schrödinger dies
-
Niels Bohr died
-
Chadwick's dead
24 July 1974 (aged 82) Cambridge, England -
Heisenberg's dead
1 February 1976 (aged 74)
Munich, Bavaria, West Germany
