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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
Fill in the blank of the following statement :
Cathode rays are a beam of fast moving _________.
An electron carries a ________ charge.
Which sub-atomic particle was discovered by Chadwick.
Write down the number of electrons in X and neutrons in Y.
An atom X has three electrons more than the noble gas configuration. What type of ion will it form?
If electrons are getting added to en element Y; then
What charge will Y migrate to during the process of electrolysis?
Choose the correct answer from A, B, C and D:
When a metal atom becomes an ion:
What is the term defined below?
A bond formed by a shared pair of electrons, each bonding atom contributing one electron to the pair.
On the basis of Thomson’s model of an atom, explain how the atom is neutral as a whole.
Rutherford’s ‘alpha (α) particles scattering experiment’ resulted in to discovery of
