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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 _________.
Fill in the blanks of the following statements :
An atom has atomic mass number 23 and atomic number 11. The atom has_________ electrons.
Cathode rays are a beam of fast moving _________
The maximum number of electrons that can be accommodated in L shell are_________
The maximum number of electrons that can go into the M shell is _________
Write down the electronic configuration of the following:
(a) `""_13^27"Y"`
(b) `""_17^35"Y"`
An element A has 1 electron in its first shell. It combines with element B having 7 electrons in its third shell. What type of bond is formed?
What is the term defined below?
A bond formed by a shared pair of electrons, each bonding atom contributing one electron to the pair.
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.
What are the noble gases?
Give a reason why noble gases have a stable electronic configuration.
_______ is a negatively charged particle.
Atoms of all metals will have ______ electrons in their outermost orbit.
