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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 _________.
What are cathode rays? How are these rays formed?
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?
In the formation of (i) oxygen molecule (ii) carbon tetrachloride molecule, state the following:
- Electronic configuration of nearest inert gas attained.
- How many electrons are shared/transferred in bond formation
- Which type of bonds these compounds form?
- Draw their orbital diagrams.
Write down the electronic configuration of the following
- 2713X,
- 3517Y.
Write down the number of electrons in X and neutrons in Y and the formula of the compound formed by X and Y.[XY3]
Give a reason why noble gases have a stable electronic configuration.
_______ is a negatively charged particle.
An atom has a number of orbits and each orbit has protons.
Helium has two electrons in the outermost orbit and so it is chemically inert.
