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प्रश्न
Explain in brief the experimental proof which led to the discovery of –
Electrons
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उत्तर
Electrons: English physicist William Crookes in 1878 discovered the cathode rays
He found that when an electric discharge is passed through a tube containing a gas at low pressure (0.01 mm of Hg).
Blue rays were emitted from the negative plate [i.e. cathode]. These rays were called cathode rays and consist of negatively charged particles now called electrons. Electrons are an essential part of each and every atom.
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संबंधित प्रश्न
How does an electron differ from a neutron?
What are cathode rays? How are these rays formed?
If an atom contains one electron and one proton, will it carry as a whole is neutral
Give the symbol and charge of each particle.
Explain the rule according to which electrons are filled in various energy levels.
An element A has 1 electron in its first shell. It combines with element B having 7 electrons in its third shell. What type of bond is formed?
What are the noble gases?
Rutherford’s ‘alpha (α) particles scattering experiment’ resulted in to discovery of
The number of electrons in an element X is 15 and the number of neutrons is 16. Which of the following is the correct representation of the element?
The relative charge of an electron is – 1.
