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प्रश्न
Explain in brief – Goldstein’s experiment which led to the discovery of the proton.
उत्तर
Discovery of – Protons
- Discovery – Constituent of positive rays i.e. particles that contain – protons.
Experiment:
- Goldstein used a modified cathode ray tube with a perforated cathode.
- He observed a new type of rays produced from the anode passing through the holes of the perforated cathode. These rays were called anode rays.
Conclusion:
- Anode rays or positive rays consist of positively charged particles now called – protons.
- The positive rays were affected by electric & magnetic fields but – in a direction opposite to that of cathode rays.
- Thus with the discovery of the positive particles – proton was initiated.
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संबंधित प्रश्न
Fill in the blank
The outermost shell of an atom is known as............................
Write true or false for the following statement
The maximum number of electrons in the first shell can be 8.
Tick the most appropriate answer.
Which of the following scientists observed that cathode rays consists of negatively charged particles?
- John Dalton
- J J Thomson
- James Chadwick
- Democritus
Draw the electronic configuration of the following elements clearly stating the number of neutrons and protons in their nucleus.
a. Beryllium b. Silicon
c. Chlorine d. Aluminium
e. Nitrogen
State whether the following statement is true or false :
The anode rays obtained from all the gases consist of positively charged particles called protons.
Fill in the blank of the following statement :
The electron has _________ charge, the proton has _________ charge, and the neutron has _________ charge.
Compare an electron, a proton and a neutron in respect of their relative masses and charges.
Compare an electron and a proton in respect of mass and charge.
Name the sub-atomic particle whose charge is 0.
State how electrons are distributed in an atom. Explain in brief the rules which govern their distribution.
