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Atomic Structure MCQs for NEET — Chemistry Questions with Answers

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Which of the following sets of quantum numbers is correct for an electron in 4f – orbital ?

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Explanation

The correct set of quantum numbers for an electron in the 4f orbital is n = 4, l = 3 (for f orbital), m = +1, s = +1/2. The principal quantum number (n) determines the shell, l determines the subshell, m determines the orientation, and s represents the spin of the electron.

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The wavelength of radiation emitted when in a hydrogen atom electron falls from infinity to stationary state 1, would be (Rydberg constant  1·09 × 107m–1)

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Explanation

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The relationship between energy E, of the radiation with a wavelength 8000 Ã… and the energy of the radiation with a wavelength 16000 Ã… is

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The energy of second Bohr orbit of the hydrogen atom is $ –328 kJ mol^{–1} $ , hence the energy of fourth Bohr orbit would be

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Explanation

The energy of an electron in the Bohr model of the hydrogen atom is given by E = -13.6/n^2 eV, where n is the principal quantum number. For n = 2, E = -13.6/2^2 = -3.4 eV or -328 kJ/mol. For n = 4, E = -13.6/4^2 = -0.85 eV or -82 kJ/mol.

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

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The most probable radius (in pm) for finding the electron in He+ is

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If the speed of electron in Bohr first orbit of hydrogen atom be x, then speed of the electron in 3rd orbit is

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If wavelength of photon is $ 2·2 \times 10 ^{– 11} m , h= 6·6 \times 10^{–34} Js$ , then momentum of photon is

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The wave number of first line of Balmer series of hydrogen is $ 15200 cm^{–1}. The wave number of the first Balmer line of Li^{1+} $ ion is

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Explanation

 As we know the energy of constant state for hydrogen species like Li^+2 or He^+ are multiple of integral type of Z^2 times the energy of hydrogen atom in stationary form

Hence the wave number of first line of ion = 3^2 * 15200 / cm 

= 9 * 15200 / cm = 136800 / cm

 

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The electrons, identified by quantum number n andl (i) n = 4, l = 1 (ii) n = 4, = 0 (iii) n = 3, = 2 (iv) n = 3, = 1 can be placed in order of increasing energy, from the lowest to highest, as

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