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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 _________.
The subatomic particle called electron was discovered by :
Give the symbol and charge of each particle.
Explain the rule according to which electrons are filled in various energy levels.
Element X has electronic configurations 2, 8, 18, 8, 1. Without identifying X,
- Predict the sign and charge on a simple ion of X.
- Write if X will be an oxidizing agent or a reducing agent. Why?
If electrons are getting added to en element Y; then
What charge will Y migrate to during the process of electrolysis?
Differentiate between the following term:
Electron and proton
Which of the following statement is always correct?
An atom has a number of orbits and each orbit has protons.
When an atom gains an electron it has more electrons and thus it carries a positive charge.
