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Structure of Atom

Sub-atomic particles:
 

Name

Symbol

Charge/C

Relative charge

Mass/kg

Electron

Proton

Neutron

e

p

n

1.6022 × 10–19

+1.6022 × 10–19

0

1

+1

0

9.1094 × 10–31

1.6726 × 10–27

1.6749 × 10–27


 

Discovery of Electron

  • Glass tube is partially evacuated (Low pressure inside the tube)

  • Very high voltage is applied across the electrodes

Results:

  • Cathode rays move from the cathode to the anode.

  • Cathode rays are not visible. 

  • These rays travel in a straight line in the absence of electric and magnetic fields.

  • The behaviour of cathode rays is similar to negatively charged particles (electrons) in the presence of an electrical …

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