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## Atomic Structure

### Chemistry

#### Previous Years Questions

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Which one of the following is the correct set of four quantum numbers (n, 1, m, s) ?
WB JEE 2022
In Bohr model of atom, radius of hydrogen atom in ground state is r1 and radius of He+ ion in ground state is r2. Which ...
WB JEE 2022
The de-Broglie wavelength ($$\lambda$$) for electron (e), proton (p) and He2+ ion ($$\alpha$$) are in the following orde...
WB JEE 2022
The number of unpaired electron in Mn2+ ion is
WB JEE 2022
The atomic masses of helium and neon are 4.0 and 20.0 amu respectively. The value of the de-Broglie wavelength of helium...
WB JEE 2021
The difference between orbital angular momentum of an electron in a 4f -orbital and another electron in a 4s-orbital is
WB JEE 2020
The number of unpaired electrons in the uranium (92U) atom is
WB JEE 2020
The radius of the first Bohr orbit of a hydrogen atom is 0.53 $$\times {10^-8}$$ cm. The velocity of the electron in the...
WB JEE 2020
The maximum number of electrons in an atom in which the last electron filled has the quantum numbers n = 3, l = 2 and m ...
WB JEE 2020
Which one of the following electronic arrangements is absurd?
WB JEE 2019
The number of unpaired electrons in Ni (atomic number = 28) are
WB JEE 2018
Which of the following electronic configuration is not possible?
WB JEE 2018
Which one of the following corresponds to a photon of highest energy?
WB JEE 2017
Which of the following sets of quantum numbers represents the 19th electron of Cr(Z = 24) ?
WB JEE 2017
If the given four electronic configurations.(i) n = 4, l = 1(ii) n = 4, l = 0(iii) n = 3, l = 2(iv) n = 3, l = 1are arra...
WB JEE 2017

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