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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
The atom of an element X has 7 electrons in its M shell.
What type of ion will be formed by an atom of element X? Write the symbol of the ion formed.
What could element X be?
Which sub-atomic particle was discovered by Chadwick.
Write down the number of electrons in X and neutrons in Y.
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?
The electronic configuration of fluoride ion is the same as that of the neon atom. What is the difference between the two?
If electrons are getting added to en element Y; then
Is Y getting oxidized or reduced?
Choose the correct answer from A, B, C and D:
When a metal atom becomes an ion:
Give a reason why noble gases have a stable electronic configuration.
Cathode rays are made up of
The maximum number of electrons that can be present in the N shell is ______.
