Historical development of atomic models, Physics

Historical development of atomic models
  • In olden days there was an idea that all matter is made of tiny indivisible particles.
  • When Thomson discovered electron, this idea became value less.
  • In 1898 Thomson proposed his model of atom 
  • According to this model positive charge is distributed uniformly over the entire body of the atom while the electrons are embedded in it.
  • However this model failed as it could not explain the observed spectral lines emitted by an atom.
  • Later in 1903 Lenard proposed his atomic model.
  • According to him a lot of empty space exists in an atom. He could not explain the stability and mass of an atom.
  • In 1911 Rutherford proposed his model of atom. According to him positively charged mass is situated at the centre and electrons are revolving around it.
  • This model failed to explain the stability of an atom.
  • In 1912, in order to account for the stability of atom, Neils Bohr, proposed a different model.
  • According to this model

i ) Electrons in an atom revolve around the nucleus in circular orbits just as the planets revolve round the sun.
ii) The electrons revolve only in certain permitted orbits called ‘stationary orbits' and do not radiate energy while in such orbits.
iii) Whenever an electron jumps from one stationary orbit to another, absorption or emission of energy takes place. This theory could explain the spectral lines emitted by different elements.

Posted Date: 8/29/2012 1:19:44 AM | Location : United States







Related Discussions:- Historical development of atomic models, Assignment Help, Ask Question on Historical development of atomic models, Get Answer, Expert's Help, Historical development of atomic models Discussions

Write discussion on Historical development of atomic models
Your posts are moderated
Related Questions
Electric Motor: A device, which converts electric energy into mechanical energy is known as Electric Motor. Factors on which the speed of Rotation of Motor Depends: The

Q. Explain what is free fall acceleration? Answer:- On earth free drop acceleration is 9.81 meters per second per second or 32.2 feet per second per second not including a

i want to do a project of physics the topic is electo magnetic induction. i want d topic and procedure

Task description You are tasked with completing the preliminary design of a plant for the production of dimethyl ether from methanol. This task involves a complete material and

A 5 kilogram mass is lifted at constant velocity from a shop floor by a rope that passes by a pulley attached to the shop's ceiling.  Neglecting the mass of the rope and frict

FORCE: "Force is that agency which causes a body to alter its state of motion or rest". It is denoted by F ?

A bathtub is filled to the brim with ice cold water and has an iceberg floating in it. It's a big bathtub the iceberg, of course, project above the surface of the tube when the ice

Photoelectric electricity is produced directly from solar energy when which following are absorbed in a semiconductor to create an electric current? a)  Protons b)  Electron

(a). Modulus of elasticity and modulus of rigidity are important parameters to measure mechanical properties of materials. With the aid of drawings, explain these parameters and gi

what is the physical significance of damping coefficient?