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Class 11

Atomic Model

⏱ Reading Time : 20 Minutes

⭐ Difficulty : ★★★☆☆

Electrons revolve around Nucleus in circular path due to Electrostatic Force of Attraction by Positive Charge present in Nucleus.

This Electrostatic Force of Attraction provide Centripetal Force for circular motion of electron.

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1 μm (micro metre) = 10^-6 m

1 nm (nano metre) = 10^-9 m

1 ⁰A (Angstrom)= 10^-10 m

Cathode Ray Discharge Tube Experiment leds to discovery of sub-atomic particle like electron, proton...
Atomic Theory of matter was first proposed on a firm scientific basis by John Dalton in 1808.
J J Thomson was the first person who discover that electrons are basic constituent of all atoms.
Cathode Ray Discharge Tube Experiment by J J Thomson lead to discovery of electron.
J J Thomson was the first person who propose first atomic model
Thomson Model of Atom is like plum pudding, raisin pudding or watermelon Model.
Thomson was awarded Nobel Prize in 1906 for his theorectical and experimental investigation on conduction of electricity by gases.
Rutherford Scattering Experiments lead to visualize that atomic model resembles the solar system.
According to Rutherford most of mass of atom is concentrate at centre and he called it Nucleus.
Nucleus and Electrons revolving around it are held by Eelctrostatic Force of Attraction.