List of top Chemistry Questions on Atomic Structure asked in JEE Main

The wave number of three spectral line of H-atom are given. The correct set of spectral lines belonging to Balmer series?

Which of the following is correct match for hydrogen-like species for the total energy of e$^-$?

The maximum number of electrons in the following two given set of quantum numbers (i) $ n = 5, \, m_l = -1 $ and (ii) $ n = 4, \, \ell = 2, \, m_l = 1, \, m_s = \frac{1}{2} $ respectively is:

Which of the following are isobars?

For electron in '2s' and '2p' orbitals, the orbital angular momentum values, respectively are :

Which of the following is/are correct with respect to the energy of atomic orbitals of a hydrogen atom?
(A) $ 1s<2s<2p<3d<4s $
(B) $ 1s<2s = 2p<3s = 3p $
(C) $ 1s<2s<2p<3s<3p $
(D) $ 1s<2s<4s<3d $
Choose the correct answer from the options given below:

Which one of the following about an electron occupying the 1 s orbital in a hydrogen atom is incorrect ? (Bohr's radius is represented by $\mathrm{a}_{0}$ )

The extra stability of half-filled subshell is due to
(A) Symmetrical distribution of electrons
(B) Smaller coulombic repulsion energy
(C) The presence of electrons with the same spin in non-degenerate orbitals
(D) Larger exchange energy
(E) Relatively smaller shielding of electrons by one another
Identify the correct statements

Which of the following postulate of Bohr's model of hydrogen atom in not in agreement with quantum mechanical model of an atom ?

Consider the ground state of an atom (Z = 24). How many electrons are arranged with Azimuthal quantum number $ l = 1 $ and $ l = 2 $ respectively?

The energy of an electron in first Bohr orbit of H-atom is $-13.6$ eV. The magnitude of energy value of electron in the first excited state of Be$^{3+}$ is _____ eV (nearest integer value)

Correct statements for an element with atomic number 9 are
A. There can be 5 electrons for which $ m_s = +\frac{1}{2} $ and 4 electrons for which $ m_s = -\frac{1}{2} $
B. There is only one electron in $ p_z $ orbital.
C. The last electron goes to orbital with $ n = 2 $ and $ l = 1 $.
D. The sum of angular nodes of all the atomic orbitals is 1.
Choose the correct answer from the options given below:

The number of electrons present in all the completely filled subshells having n=4 and s=+½ is _____. (Where n = principal quantum number and s = spin quantum number).

$\textbf{Match List I with List II}$
$\begin{array}{|c|c|c|} \hline \text{List I (Spectral Series for Hydrogen)} & \text{List II (Spectral Region/Higher Energy State)} \\ \hline \text{A. Lyman} & \text{I. Infrared region} \\ \text{B. Balmer} & \text{II. UV region} \\ \text{C. Paschen} & \text{III. Infrared region} \\ \text{D. Pfund} & \text{IV. Visible region} \\ \hline \end{array}$
$\text{Choose the correct answer from the options given below :-}$

Compare the energies of following sets of quantum numbers for multielectron system.
(A) n = 4, 1 = 1
(B) n= 4, l = 2
(C) n = 3, l = 1
(D) n = 3, l = 2
(E) n = 4, 1 = 0
Choose the correct answer from the options given below :

The four quantum numbers for the electron in the outer most orbital of potassium (atomic no. 19) are

The electronic configuration of Einsteinium is :(Given atomic number of Einsteinium = 99)

The ionization energy of sodium in $kJ \;mol^{−1}$. If electromagnetic radiation of wavelength 242 nm is just sufficient to ionize sodium atom is ______.

The number of radial node/s for 3p orbital is:

Frequency of the de-Broglie wave of the electron in Bohr's first orbit of the hydrogen atom is ______ $ \times 10^{13} \, \text{Hz} $ (nearest integer).
Given:$R_H$ (Rydberg constant) = $2.18 \times 10^{-18} \, \text{J}$$h$ $($Planck's constant)= $6.6 \times 10^{-34}$$\text{J.s}$

In an atom, total number of electrons having quantum numbers n = 4, $|m_l|$ = 1 and $m_s$ = $-\frac{1}{2}$ is ________.

$C_{11}H_{18}O_{12}$The value of the Rydberg constant ($R_H$) is $2.18 \times 10^{-18} \, \text{J}$. The velocity of an electron having mass $9.1 \times 10^{-31} \, \text{kg}$ in Bohr's first orbit of the hydrogen atom is:$\dots \times 10^5 \, \text{ms}^{-1}$ (nearest integer).

The incorrect postulates of the Dalton's atomic theory are :
(A) Atoms of different elements differ in mass.
(B) Matter consists of divisible atoms.
(C) Compounds are formed when atoms of different element combine in a fixed ratio.
(D) All the atoms of given element have different properties including mass.
(E) Chemical reactions involve reorganisation of atoms.
Choose the correct answer from the options given below :

The number of different chain isomers for $ \text{C}_7\text{H}_{16} $ is ______.

Based on Heisenberg's uncertainty principle, the uncertainty in the velocity of the electron to be found within an atomic nucleus of diameter $ 10^{-15} \, \text{m} $ is $ \dots \dots \times 10^9 \, \text{ms}^{-1} $ (nearest integer). \[ \text{[Given: mass of electron} = 9.1 \times 10^{-31} \, \text{kg, Planck's constant (} h \text{)} = 6.626 \times 10^{-34} \, \text{Js]} \] \[ \text{(Value of } \pi = 3.14) \]