The Atom
J.J Thomson discovered the electron. He discovered it in 1897, when he was doing a series of experiments that is designed to study the nature of electronic discharge. This took place in a high-vacuum cathode-ray tube. He saw that the deflection of the rays by electrically charged plates and magnets. He found out that the large value for the charge-to-mass ratio.
In 1904 Thomson suggested that a model of the atom is like a sphere of positive matter (protons), that has electrons in it. They are positioned by electrostatic forces. He tried to estimate the number of electrons in an atom by measuring the amount of scattering light created by different rays. His methods led to the creation of the mass spectrograph. His assistant, Francis Aston, developed the instrument. The improved version was able to discover isotopes. Isotopes are atoms of the same element with different atomic weights. J.J. Thomson was one of the greatest scientist and his discoveries have impacted science throughout the ages.
In 1904 Thomson suggested that a model of the atom is like a sphere of positive matter (protons), that has electrons in it. They are positioned by electrostatic forces. He tried to estimate the number of electrons in an atom by measuring the amount of scattering light created by different rays. His methods led to the creation of the mass spectrograph. His assistant, Francis Aston, developed the instrument. The improved version was able to discover isotopes. Isotopes are atoms of the same element with different atomic weights. J.J. Thomson was one of the greatest scientist and his discoveries have impacted science throughout the ages.