# SPDEV

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1. Bohr's first postulate
An electron in an atom exists in only certain stable, circular orbits called "Energy levels"
2. 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
3. Bohr's third postulate
• The only orbits (energy levels) an electron can exist are those with the angular momentum = nh/2π
• m0vrn = nh/2π
4. ν = c/λ

Frequency (ν) = Hz
Wavelength (λ) = m
Velocity (c) = m/s
c = 3 x 108m/s
5. E = E2 – E1

= hν
= h c / λ

h = Planck’s constant
= 6.626 x 10-34 Joule.sec
6. 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.
7. En = -13.6 / n2 eV

rn= 0.53 n2 A
8. 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
9. The maximum number of electrons that can occupy an energy level in any atom
= 2n2

[where n is the order of the energy level (n=1,2,3,4,….).]
10. Bohr’s atom model explains the behaviour of hydrogen atom.
 Author: bananahere ID: 31852 Card Set: SPDEV Updated: 2010-08-30 16:09:27 Tags: SPDEV1 Folders: Description: Chapter 1 Show Answers: