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Structure of Atom - Coggle Diagram
Structure of Atom
Quantum numbers
n = 1,2,3,4.....
L= 0 to (n-1)
m= -l to +l
s=+1/2 and -1/2
n+l energy rule
systematic distribution of electrons
1s 2s 3s 3p 4s 3d
PHOTOELECTRIC EFFECT
Light strikes the surface and electrons are ejected
small packets called PHOTONS
Formula: E=hv
value of h: 6.62* 10^-34
E is directly proportional to v
Incident Energy = Threshold Energy+ Kinetic energy
hv=hv'+1/2m^2
Bohr's model
Orbit/Stationary state- path in which e- moves
Max energy of an electron is taken as 0 at infinity
Quantisation of energy
Energy of an electron is fixed
E is lost when e- moves from higher orbit to lower orbit
Max energy of an electron is taken as 0 at infinity
IMP BASIC FORMULAS
radius of atom
velocity of e-
energy released during transfer of e-
Hydrogen spectrum : Atomic emission spectrum
Paschen
Brackett
Balmer
Pfund
Lyman
Humphrey
Some Constants;
Rydberg = 109677cm-1
Wave number= 1/ lambda
1 ev = 1.6020 *10^-19J
De broglie concept of dualism
E=mc^2
E=hv
Lambda=h/p or h/mv
Heinsberg Uncertainty Principle
Talks about uncertainty in position ad and momentum
delta x*delta p=h/4pi
Intro
Dualism
Particle nature
Eg- light, electron
Wave nature
Eg- Light,electron
Wave and particle:Both light and electron
Thomson's Model
Example of a watermelon
Rutherford's Model
Experiment with gold foil
Conclusion
Observations
undeflected particles
Particles deflected by small angles
Particles deflected by 180 degress
Advantages
Drawbacks