Historical development of atomic models, Physics

Assignment Help:
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.


Related Discussions:- Historical development of atomic models

Project, comparison of magnetic moments using an vibrational magnetometer

comparison of magnetic moments using an vibrational magnetometer

Vectors and scalars, the accelaration of a plane as it takes off would that...

the accelaration of a plane as it takes off would that be a vector or a scalar

State conditions to obtain sustained interference of light, State two condi...

State two conditions to obtain sustained interference of light In Young's double slit experiment, using light of wavelength 400 nm, in terference fringes of width 'X' are obtain

Is the q the source charge or else is it the test charge, Questions: A ...

Questions: A source charge generates an electric field to exist in the region of space around that source charge. The electric field exerts a force on some test charge that fin

Triode as an amplifiers, Amplifier is a functioning by which the amplitude ...

Amplifier is a functioning by which the amplitude of variation of ac signal voltage / current/ power can be enhanced (i) Principle and circuit diagram: The amplifying action of

Doppler effect, Doppler Effect Describing the classical Doppler Effect ...

Doppler Effect Describing the classical Doppler Effect for sound waves. The Doppler Effect is a means through that wave properties (specifically frequencies) are influenced thr

Calculate its angular speed immediately after the impact, A thin uniform re...

A thin uniform rectangular sign hangs vertically above the door of a shop. The sign is hinged to a stationary horizontal rod along its top edge. The mass of the sign is 2.40 kg and

Calculate the top heat loss coefficient, Calculate the top heat-loss coeffi...

Calculate the top heat-loss coefficient for a solar collector with a single glass cover having the following specifications (neglect edge effects), also calculate the ambient air t

Subset [tabular method], 1.A=the set of whole numbers less tan 4 ? 2.B=the ...

1.A=the set of whole numbers less tan 4 ? 2.B=the set of prime numbers less than 19 ? 3.C=the set of first three days of week?

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd