J. J. Thomson, Date of Birth, Place of Birth, Date of Death

J. J. Thomson

British physicist

Date of Birth: 18-Dec-1856

Place of Birth: Cheetham Hill, England, United Kingdom

Date of Death: 30-Aug-1940

Profession: physicist, mathematician, university teacher

Nationality: United Kingdom

Zodiac Sign: Sagittarius

Sir Joseph John Thomson (18 December 1856 – 30 August 1940) was an English physicist and Nobel Laureate in Physics, credited with the discovery and identification of the electron, the first subatomic particle to be discovered. In 1897, Thomson showed that cathode rays were composed of previously unknown negatively charged particles (now called electrons), which he calculated must have bodies much smaller than atoms and a very large charge-to-mass ratio.
Thomson is also credited with finding the first evidence for isotopes of a stable (non-radioactive) element in 1913, as part of his exploration into the composition of canal rays (positive ions).
His experiments to determine the nature of positively charged particles, with Francis William Aston, were the first use of mass spectrometry and led to the development of the mass spectrograph.Thomson was awarded the 1906 Nobel Prize in Physics for his work on the conduction of electricity in gases.