Question

what is bohr's model for hydrogen atom

Answer 1

Hii frnd here's the answer to the given question

Bohrs model is based on plancks quantam theory

POSTULATES OF BOHRS MODEL

1) Electron revolves around the nucleus in circular paths of fixed radius and energy. The circular paths are called as orbits or energy levels or shells . These are represented by 1,2,3,4,5,...........or K,L,M,N........

2) Each orbit is associated with a definite amount of energy. Hence these orbits are called as energy orbits or energy levels or energy shells

3) As long as Electron revolves around the nucleus in these circular Paths , they neither emits nor absorb energy . Hence these orbits are called as stationery orbits .

4) Energy of electron changes only when electron jumps from one energy to another energy level . Energy is emitted when an electron jumps from higher energy to lower energy levels

∆E = E2- E1

v = ∆E/ h ➡ E2 - E1

where E1 and E2 are lower and higher energy levels. This expression is commonly known as bohrs Frequency rule

5) The angular momentum of an electron is an orbit is quantised ie the angular momentum of an electron is an integral multiple h/ 2π

mevr = n.h/ 2 π

me = mass of the electron, v = velocity of electron, r = radius of orbit , n = principal quantam number

BOHRS EXPLANATION TO HYDROGEN SPECTRUM

Hydrogen atom contains only one electron.When hydrogen gas is subjected to electric discharge, Hydrogen molecules absorb energy and dissociates into atoms .

The electrons in atoms absorb different amounts of energies and excited to different higher energy levels. At higher energy levels energy is more , stability is less . Hence these electrons jump back to different lower energy levels in one or several steps by emmiting light radiations on photographic plate appears as hydrogen spectrum

➡ When an electron jumps from any higher levels to first energy level, a series of spectral lines obtained which is called as Lyman series , observed in UV Region ( n= 1)

➡When an electron jumps from any higher levels to second energy level, a series of spectral lines obtained which is called as Balmer series , observed in Visible Region ( n= 2)

➡ When an electron jumps from any higher levels to third energy level, a series of spectral lines obtained which is called as Paschn series , observed in near infrared region ( n= 3)

➡When an electron jumps from any higher levels to fourth energy level, a series of spectral lines obtained which is called as Brackket series , observed in UV Region ( n= 4)

➡When an electron jumps from any higher levels to fifth energy level, a series of spectral lines obtained which is called as Pfund series , observed in UV Region ( n= 5)

➡ The wave number of these spectral lines can be calculated by using Rydberg equation.

V= 1/ lambda = Rh ( 1/ n1^ 2 - 1/ n2^ 2)


Hope ull get the answer to the given question and mark as brainliest one......✌✌✌✌
where Rh is called as Rydberg constant and its value is 109677 ( cms ) inverse.

Answer 2

Hey mate......

here's ur answer.......


Hope it helps ☺️❤️