Advertisements
Advertisements
Question
Explain in brief the experimental proof which led to the discovery of –
Electrons
Advertisements
Solution
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
RELATED QUESTIONS
All the gases from cathode rays and anode rays when electricity is passed through them :What does the formation of cathode rays tell us about the atoms?
What is the nature of the charge on Cathode rays .
If an atom contains one electron and one proton, will it carry as a whole is neutral
An atom X has three electrons more than the noble gas configuration. What type of ion will it form?
Name or state the following:
Ion formed by the gain of an electron(s)
An element X has 2 electrons in its M shell, it forms a bond with an element Y which has 7 electrons in its third orbit.
- Write the formula of the compound formed.
- Which nearest inert gas electronic configuration will element X and Y acquire.
- Show by orbital diagram the formation of the compound between X and Y.
Atoms of all metals will have ______ electrons in their outermost orbit.
The maximum number of electrons that can be present in the N shell is ______.
When an atom gains an electron it has more electrons and thus it carries a positive charge.
Assertion: Helium has four electrons in the outermost orbit.
Reason: Neon has eight electrons in the outermost orbit.
