Advertisements
Advertisements
Question
Imagine removing one electron from He4 and He3. Their energy levels, as worked out on the basis of Bohr model will be very close. Explain why.
Solution
Bohr model is applicable for hydrogen atom-and some lighter atoms in which a single electron revolves around a stationary nucleus of positive charge Ze (called hydrogen-like atom). If we remove one electron from He4 and He3, atoms contain one electron and become hydrogen-like atoms. Now we can apply the Bohr model to define the energy levels.
APPEARS IN
RELATED QUESTIONS
Define ionization energy.
Calculate the shortest wavelength of the spectral lines emitted in Balmer series.
[Given Rydberg constant, R = 107 m–1]
How does one explain, using de Broglie hypothesis, Bohr's second postulate of quantization of orbital angular momentum?
Show that the radius of the orbit in hydrogen atom varies as n2, where n is the principal quantum number of the atom.
How would the ionization energy change when the electron in the hydrogen atom is replaced by a particle of mass 200 times that of the electron but having the same charge?
Using Bohr’s second postulate of quantization of orbital angular momentum show that the circumference of the electron in the nth orbital state in hydrogen atom is n times the de Broglie wavelength associated with it.
A uniform magnetic field B exist in a region. An electron projected perpendicular to the field goes in a circle. Assuming Bohr's quantization rule for angular momentum, calculate (a) the smallest possible radius of the electron (b) the radius of the nth orbit and (c) the minimum possible speed of the electron.
Answer the following question.
State Bohr's quantization condition of angular momentum. Calculate the shortest wavelength of the Bracket series and state to which part of the electromagnetic spectrum it belongs.
Plot a graph showing the variation of de Broglie wavelength (X) associated with a charged a particle of mass m, versus `1/sqrtV` where V is the potential difference through which the particle is accelerated. How does this graph give us information regarding the magnitude of the charge of the particle?
The simple Bohr model is not applicable to He 4 atom because ______.
- He4 is an inert gas.
- He4 has neutrons in the nucleus.
- He4 has one more electron.
- electrons are not subject to central forces.
