class 11 chapter 2 structure of atom.pptx

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1. Structure of the atom .

2. Line spectrum of hydrogen Where, R is the Rydberg's constant, n₁ is the initial energy level and n₂ is the final energy level . The emission spectrum of hydrogen is divided into a number of spectral lines with wavelengths given by the Rydberg formula. These observed spectral lines are due to the electron making transitions between the energy levels in an atom.

3. E mission & Absorption Spectrum :

4. Spectra Lines Of Hydrogen Lyman series It is first spectral series of H . It was found to be in ultraviolet region by Lyman in 1898. For it value of n₁ = 1 and n₂ = 2, 3, 4 where 'n,' is ground state and 'n,' is called excited state of electron present in a H-atom . The wavelength of marginal line (i.e. n₂ = ∞ ) = for all series. So for lyman series. Line spectrum of hydrogen

5. Bohr’s model for hydrogen atom Atom is spherical and positive charge is present inside nucleus. Whereas negative charge revolve around nucleus Electrons revolve around nucleus in fixed orbits called Shells or stationary orbits. (K,L,M,N.....) Electrons do not emit or absorb energy while revolving in a shell. ( 1ev = ) Where, z = Atomic no. n= shell no.

6. Electron release or absorb energy when it moves (jumps) from one shell to another. π Angular momentum of e- is integrel multiple of h/2 π Radius of orbit

7. Thank you 😀😀😀😀 ~ MMAAP