Please enable JavaScript.
Coggle requires JavaScript to display documents.
ATOMIC MODEL (NEIL BOHR (1913) (Electrons orbited nucleus in circle,…
ATOMIC MODEL
NEIL BOHR (1913)
Electrons orbited nucleus in circle
Electrons have quantized energy for stable atom
Planck's contants, h = 6.63x10^-34
Valid for hydrogen atom only
Electrons fiexd in circular orbits violates the laws of classicalmechanical physics
Angular momentum violatesthe Heisenburg uncertainty principle
There are are fixed angular momentum for each quantized orbital
ERNEST RUTHERFORD (1911)
Positive charges and atoms concentrated in the centre of atom
Radius = 10^-14
Negative charges located outside to the orbit of nucleus
THE UNCERTAINTY PRINCIPLE( HEISENBERG 1927)
1 : Impossible to simultaneous describe the absolute accuracy position and momentum of particle
2 : Impossible to simultaneous describe absolute accuracy energy of particle and instant time of particle has this energy
We able to determine probability of finding electron at a particular position
WILSON AND SOMMERFELD (1916)
Bohr model used in physical system which is a particle's motion is periodic with time
Allow possibility of elliptical orbits
WAVE PARTICLE DUALITY
de Broglie : particle should be expected to show wave-like properties
Momentum of photon : p=h/lamda
JJ THOMSON (1911)
Continuous positive charge sphere is embedded with negative electrons
SCHRODINGER'S WAVE EQUATION
Describe the motion of electron in a crystal based on wave-particle duality
