Request a call back

Join NOW to get access to exclusive study material for best results

ICSE Class 7 Answered

Please give me the answer of these questions as soon around possible
question image
Asked by Sahgalvarsha | 24 Nov, 2018, 06:44: PM
answered-by-expert Expert Answer
Discovery of Fundamental particles of an atom:
 
1)Discovery of the Electron
  • A British scientist J.J. Thomson was the first one to discover the electron in the year 1897.
  • J.J. Thomson performed an experiment to know the characteristics and constituents of the cathode rays.
  • From his experiment, Thomson arrived at the conclusion that, cathode rays are nothing but a stream of negatively charged particles.
  • These negatively charged particles are called as electrons.

2) Discovery of the Proton

  • A German scientist, E. Goldstein in 1886, modified the discharge tube and passed an electric current through it.
  • He found that the positively charged rays were emitted from the anode in the discharge tube. These rays were called canal rays.
  • These positively charged particles were named as protons by a British scientist, Ernest Rutherford.

3) Discovery of the Neutron

  • In 1932, James Chadwick observed that when beryllium was exposed to α-particles, different kinds of particles were emitted.
  • These particles had about the same mass as protons and carried no electrical charge.
  • Hence, Chadwick named this particle as the neutron.
Structure of an atom:

Answered by Ramandeep | 27 Nov, 2018, 09:52: AM
ICSE 7 - Chemistry
Asked by hiteshrajput2402 | 27 Jan, 2024, 02:17: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
ICSE 7 - Chemistry
Asked by hih81442 | 27 Jul, 2023, 10:02: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
ICSE 7 - Chemistry
Asked by ranjanclw1979 | 20 Feb, 2021, 01:53: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
ICSE 7 - Chemistry
Asked by arpanakispotta32 | 20 Feb, 2021, 09:48: AM
ANSWERED BY EXPERT ANSWERED BY EXPERT
ICSE 7 - Chemistry
Asked by aasthabhagat11 | 29 Sep, 2020, 07:16: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
ICSE 7 - Chemistry
Asked by anshpatel8582.7sdatl | 01 Jun, 2020, 10:20: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
ICSE 7 - Chemistry
Asked by anshpatel8582.7sdatl | 01 Jun, 2020, 10:06: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
ICSE 7 - Chemistry
Asked by dhimantsinhsolanki4683.7sdatl | 22 May, 2020, 12:24: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
ICSE 7 - Chemistry
Asked by anshpatel8582.7sdatl | 17 May, 2020, 05:30: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
ICSE 7 - Chemistry
Asked by rudrajadhav41.7spicertl | 14 May, 2020, 01:35: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
Get Latest Study Material for Academic year 24-25 Click here
×