Bohr's theory—
Following are the improtant assumptions made by bohr—
1. All electrons revolves around the nucleus in the circular orbits.
2. The orbits in which electron revolve is stationary and disturb.
3. Only those orbits are said to be stationary and diserete for which angular momentum of electron is an integral multiple of h/2π.
Mathematically, it can be written
4. An electron / atom can jump from higher orbit/ energy state to lower energy state by releasing energy and released energy appears as only one photon.
Then is called Bohr's frequency condition.
Bohr's explanation of spectral liner series of hydrogen atom According to Bohr's frequency condition when an electron/ atom jumps from higher orbit / energy state to lower orbit/ energy stat, it release the corresponding electron is called spectral series.
1. Lyman series—The spectral due to the transion of an electron from any outer orbit, ni to the first orbit (nf = 1) from spectral series is called Lyman series.
For Shortest Wavelength
2. Balmer series—The spectral liner emitted due to the transition of an electron from any outer orbit (ni) to the second orbit (nf = 2) from a spectral series is called Balmer series.
It lies in the “Visible region”
3. Paschen series—The spectral liner emitted due to the transition of an electron from any outer (ni ) to the third orbit (nf = 3) from a spectral series is called paschen series.
It lier in infra red region
4. Bracket series—The spectral liner emitted due to the transition of an electron from any outer orbit (ni ) to the fourth orbit (nf = 4) from spectral liner is called Bracket series. It lies in “far infrared red” region
5. Pfund series—The spectral liner emitted due to the transition of an electron from any outer orbit (ni ) to the fifth orbit (nf = 5) from a spectral series is called Pfund series. It also lies in far infra-red region
