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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
Name the subatomic particle whose relative charge is : –1
The atom of an element X has 7 electrons in its M shell.
Is it a metal or a non-metal?
What are inert elements?
Explain the following:
Atoms combine by transfer and sharing of an electron(s).
The electronic configuration of nitrogen is (2, 5). How many electrons in the outer shell of a nitrogen atom are not involved in the formation of a nitrogen molecule?
Name or state the following:
A bond formed by transfer of electron(s)
What is the relation between the number of protons and the number of electrons in an atom?
_______ is a negatively charged particle.
Helium has two electrons in the outermost orbit and so it is chemically inert.
When an atom gains an electron it has more electrons and thus it carries a positive charge.
