The flashcards below were created by user
on FreezingBlue Flashcards.
Bohr's first postulate
An electron in an atom exists in only certain stable, circular orbits called "Energy levels"
Bohr's second postulate
- An electron absorbs energy to jump from a lower orbit to a higher orbit
- An electron emits energy when it falls from a higher orbit to a lower orbit
Bohr's third postulate
- The only orbits (energy levels) an electron can exist are those with the angular momentum = nh/2π
- m0vrn = nh/2π
ν = c/λ
Frequency (ν) = Hz
Wavelength (λ) = m
Velocity (c) = m/s
c = 3 x 108m/s
E = E2
= h c / λ
h = Planck’s constant
= 6.626 x 10-34 Joule.sec
F = e2/4πεoεr2 N
e = electron charge, r = distance of separation (m),
εo = permittivity of free space = 8.854 x 10-12 F /m,
ε = dielectric constant of the medium.
En = -13.6 / n2 eV
rn= 0.53 n2 A
Ionization energy is....
- is the energy required by an electron to leave the atom.
- i.e. the electron in an atom should get sufficient energy to reach
The maximum number of electrons that can occupy an energy level in any atom
[where n is the order of the energy level (n=1,2,3,4,….).]
Bohr’s atom model explains the behaviour of hydrogen atom.