MEDIUM
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The Bohr model is applicable to hydrogenic atoms.

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Important Questions on Atoms

EASY
The ionization potential of hydrogenic ions P and Q are VP and VQ respectively. If VQ<VP then radii
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Consider a hydrogen-like ionized atom with atomic number Z with a single electron. In the emission spectrum of this atom, the photon emitted in the n=2 to n= 1 transition has energy 74.8 eV higher than the photon emitted in the n=3 to n=2 transition. Given that the ionization energy of the hydrogen atom is 13.6 eV, what is the value of Z?
EASY
Imagine that the electron in a hydrogen atom is replaced by a muon μ. The mass of muon particle is 207 times that of an electron and charge is equal to the charge of an electron. The ionization potential of this hydrogen atom will be:-
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The ionization potential of hydrogen atom is 13.6 V. How much energy need to be supplied to ionize the hydrogen atom in the first excited state.
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Monochromatic radiation of wavelength λ is incident on a hydrogen sample in ground state. Hydrogen atom absorbs a fraction of light and subsequently emits radiations of six different wavelengths. The wavelength λ is
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λ2 and λ4 are the wavelengths of photons required to excite the Hydrogen atom from its ground state to its second and fourth excited states, respectively. What is the correct ratio λ2/λ4 ?
EASY
The amount of energy required to separate a hydrogen atom into a proton and an electron is
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Drawing a neat energy level diagram, show the various spectral series of hydrogen atom and also write the formula for frequency of these spectral lines.
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12 eV energy is given to electron in third orbit of H-atom, then final energy of electron when it ionise from third orbit, is
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Minimum excitation potential of Bohr's first orbit of Hydrogen atom is_____.
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If the light from Balmer series of hydrogen is used to eject photoelectrons from a metal, then the maximum work function of the metal can be
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A neutron moving with a speed 'v' makes a head on collision with a stationary hydrogen atom in ground state. The minimum kinetic energy of the neutron for which  perfactly inelastic collision will take place is :
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A hydrogen atom is in an excited state of principal quantum number n. It emits a photon of wavelength λ when it returns to the ground state, the value of 'n' is ________
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Energy of an electron in the lowest energy state of the hydrogen atom =13.6eV. Find the energy needed to remove an electron from the fourth orbit.
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A hydrogen atom in the ground state absorbs, E amount of energy. If the orbital angular momentum of the electron is increased by h2π(h= Plank constant), then the magnitude of ΔE is
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Write the name of different series of emission spectrum of Hydrogen and represent them by the formula.
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Calculate the longest and shortest wavelength in the Lyman series of hydrogen emission spectrum. ( Rydberg constant R=1.1×107 m-1)
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In the hydrogen atom spectrum, let E1 and E2 are energies for the transition n=2n=1 and n=3n=2 respectively. The ratio E2/E1 is
MEDIUM
A He+ ion is in its first excited state. Its ionization energy is:
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A singly ionized helium atom in an excited state n=4 emits a photon of energy 2.6 eV. Given that the ground state energy of hydrogen atom is 13.6 eV, the energy Et and quantum number n of the resulting state are respectively,