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460 BCE
Democritus
He was a scholar of the greek golden age,born in approximantely 460 BCE.
He was considered by some to be the father of science because he and his mentor, leucippus both materials, or someone who believed that there were natural laws that govern nations.
He was remebered as the laughing philospher amoung his fellow abderans as the Mocker.
During his youth democritous traveled to search for knowledges. -
John Dalton
He was born on September 6, 1766 in Eagles field, England. -
John Dalton
On October 30, 1794 after his arrival in Manchester, Dalton was elected a member of the Manchester literary and philosophical society. -
John Dalton
In 1800 he became secretary of the Manchester Literary and philosophical society. -
John Dalton
In 1801 he orally presented an important series of papers, entitled experimental Essays on the constitution of mixed gasses on the pressure of steam and other vapors at different temp. -
John Dalton
In 1803 he announced the atomic theory.
In 1803 he proceeded to published table of relative atomic weights. -
J.J. Thomson
He was born on December 18, 1856 in Chatham hill, England -
Max plank
He was born in Kiel, Germany, on April 23,1858. -
Robert Millikan
He was born on the March 22, 1868, in Morrison, Illinois. He was the second son of the reverend Silas . He led a rural existence in childhood, attending the Maqouketa high school. -
Ernest Rutherford
He was born on August 30,1871 in Nelson, New Zealand. He was the fourth child and second son in a family of seven sons and five daughters. Ernest received his early education in government schools; at the age of 16 entered Nelson college school. -
Thomson
In 1876 he received a small scholarship to attend trinity college at Cambridge to study mathematics. -
Niel Bohr
He was born on October 7, 1885 in Copenhagen. His father was a physiologist and was largely responsible for showing him interest in physics. -
Millikan
In 1886 he entered Oberlin college after working as a court reporter. -
Ernest
In 1889 he was awarded a university scholarship and proceed to the University of New Zealand. -
Millikan
In 1891 he took for two years a teaching post in elementary physics. -
James Chadwick
He was born in Cheshire, England on October 20,1891. -
Ernest
In 1893 with a double first in Mathematics and physical science and he continued with research work in the college for a short time. -
Millikan
In 1893 after obtaining his masters in physics he was assigned fellow in physics at Columbia University. -
Thomson
In 1894 thomson began studying cathode rays, which are glowing beams of light that follow an electrical discharge in a high vacuum tube. Thomson devised better equipment and methods.
He discovered that the ratio was the same regardless of what type of gas was used, which led him to conclude that the particles that mad eup the gasses were universal. He determined all matter was made of tiny particles that are smaller than atoms. He called them cirpulses athloh now it is electrons. -
Plank
The Prussian Academy of science appointed him to become a member in 1894. -
Plank
In 1900, he introduced his derivation of the relationships: this was based on the revolutionary could only take on discrete values. -
Bohr
In 1903, he entered Copenhagen university where he came under the guidance of professor Christiansen. Bohr’s studies became more theoretical in character. His work on the explanation of the properties of metals with aid of the electron theory. -
Thomson
Thomson won the 1906 Nobel prize in physics among many accolades . -
Thomson
In 1906 Thomson began studying positively charged ions,or positive rays. -
Plank
He wrote a book about theory of heat radiant ion in 1906. -
Ernest
In 1907 to become langworthy professor of physics in the university of Manchester, succeeding sir Arthur. -
Ernest
In 1910, he investigated into the scattering of alpha rays and the nature of the inner structure of the atom which caused such scattering led to the postulation of his concept of the nucleus. He stated that the whole mass of the atom and the same time all positive charge of the atom is concentrated at the center. -
Chadwick
In 1911 he graduated from the honors school of physics and spent two years under Professor Rutherford. -
Bohr
In 1911 he stayed at Cambridge under the guidance of J.J. Thomson working on his own theory. -
Thomson
In 1912 Thomson was led to a famous discover, when he channeled a stream of ionized neon through magnetic and an electric field and used deflection techniques to measure the charge to mass ratio. In doing so he discovered that neon was composed of 2 different kinds -
Ernest
in 1912 Niels Bohr joined Ernest at Manchester and he adapted Rutherford’s nuclear structure to Max Planck’s quantum theory. -
Ernest
In 1913 H.G. Moseley and Ernest used cathode rays to bombard atoms of various elements and showed that the inner structure corresponded with a group of lines which characterize the element. -
Bohr
In In 1913 a philosophical Magazine was published about his work. He passed on the study of the structure of atoms on the basis of Rutherford’s discovery of the atomic nucleus. He succeed in working out and presenting a picture of the atomic structure that will later improve. -
Chadwick
In 1919 he returned to England after the war to resume work under Rutherford. In Cambridge Chadwick joined Rutherford in accomplishing the transmutation of other light elements. -
Millikan
During the 1920 - 1923 Millikan investigated with hot-spark spectroscopy of the elements.It extended the ultraviolet spectrum downward far beyond the known limit. This discovery of his law of motion of particle falling towards the earth after entering earth’s atmosphere was ed to a electrical phenomena. -
Bohr
In 1922 the recognition of the atomic structure was award of the Nobel prize. -
Millikan
In 1924 he wrote science and life. -
Millikan
In 1927 he wrote the book evolution in science and religion. -
Chadwick
In 1927 he was elected Fellow of the royal society. -
Millikan
In 1930 he wrote Science and the New civilization. -
Millikan
In 1932 he wrote Time, Matter and values. -
Chadwick
In 1932, Chadwick made a fundamental discovery in the domain of the nuclear science. He proved the existence of neutrons which are particles that devoid electrical charge. Chadwick in this way prepared the way towards the creation of the atomic bomb. -
Chadwick
He was also won noble prize for physics in 1935,. -
Bohr
In 1936 he justified the nuclear process and described it more. -
Thomson
He died in the year of 1940. -
Plank
He died on October 4, 1947 at Gottingen. -
Millikan
He died on December 19,1953. -
Bohr
He died on November 18, 1962 in Copenhagen.
