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Bohr's Model Of An Atom - Practice Questions & MCQ

Edited By admin | Updated on Sep 25, 2023 25:23 PM | #NEET

Quick Facts

  • Radius, velocity and the energy of nth Bohr orbital is considered one the most difficult concept.

  • 30 Questions around this concept.

Solve by difficulty

Which of the following statements in relation to the hydrogen atom is correct?

Energy of an electron is given by   E=-2.178\times 10^{-18}J\left ( \frac{Z^{2}}{n^{2}} \right ),Wavelength of light required to excite an electron in a hydrogen atom from level n = 1 to n = 2 will be:

(h=6.62\times10-34Js and c = 3.0 \times108 ms-1)

Calculate the energy in joule corresponding to light of wavelength 45 nm : (Planck's constant h = 6.63 x 10-34 Js;

speed of light c = 3 x 108 ms -1)

According to the Bohr Theory, which of the following transitions in the hydrogen atom will give rise to the least energetic photon?

 If m and e are the mass and charge of the revolving electron in the orbit of radius r  for hydrogen atom, the total energy of the   
revolving electron will be :                                                    

 

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Concepts Covered - 2

Bohr’s Model for Hydrogen Atom

Bohr's model :

1. Force of attraction between the nucleus and an electron is equal to the centripetal force.

2. mvr= nh/2\pi ,  n = principal quantum number.

3. Energy can be absorbed or emitted when electron transfer orbit  E_{1}-E{_{2}}=h\nu

Bohr’s Model for Hydrogen Atom/Hydrogen-like atoms :

The frequency of radiation (ν) absorbed or emitted when electron jumps between two stationary states that differ in energy by ∆E, is given by:

v= \Delta E/h= \left ( E_{2} -E_{1}\right )/h

E2 is higher energy state and E1 is lower energy state

Radius, velocity and the energy of nth Bohr orbital

 

Bohr radius of nth orbit:

r_{n}= 0.529 \frac{n^{2}}{z}A^{0}

where Z is atomic number

Velocity of electron in nth orbit:

v_{n}= (2.165\times 10^{6})\frac{z}{n}\: m/s

where z is atomic number

Total energy of electron in nth orbit:

E_{n}= -13.6\: \frac{z^{2}}{n^{2}}eV

Where z is atomic number

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Bohr’s Model for Hydrogen Atom
Radius, velocity and the energy of nth Bohr orbital

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Reference Books

Bohr’s Model for Hydrogen Atom

Chemistry Part I Textbook for Class XI

Page No. : 46

Line : 15

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