Advertisements
Advertisements
प्रश्न
Explain in brief the experimental proof which led to the discovery of –
Electrons
Advertisements
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.
APPEARS IN
संबंधित प्रश्न
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 _________
The subatomic particle called electron was discovered by :
If an atom contains one electron and one proton, will it carry as a whole is neutral
What are inert elements?
If electrons are getting added to en element Y; then
Is Y getting oxidized or reduced?
On the basis of Thomson’s model of an atom, explain how the atom is neutral as a whole.
The number of electrons in an element X is 15 and the number of neutrons is 16. Which of the following is the correct representation of the element?
Which of the following statement is always correct?
All non–metals will have ______ electrons in the outermost orbit of their atoms.
When an atom gains an electron it has more electrons and thus it carries a positive charge.
