List of top Chemistry Questions on Quantum Mechanical Model of Atom

Which of the following is a correct set of four quantum numbers for a 4d orbital?

The correct order of penetration power of the orbitals is

Which of the following is a correct set of four quantum numbers for 4d orbital?

The pair of orbitals with electron density maximum along the axes is

The four quantum numbers for the electron in the outermost orbital of potassium \((Z=19)\) are

The angular momentum of an electron in an orbit \(X\) of hydrogen atom is \(\frac{2h}{\pi}\). Maximum number of orbitals possible in \(X\) is

Which quantum number determines the shape of an orbital?

Which of the following is the CORRECT statement about \(\Psi^2\)?

The number of nodal surfaces present in '4s' orbital is

For a given sub-shell with azimuthal quantum number 'l' the number of magnetic quantum numbers possible is

Which of the following statements are correct about the postulates of quantum mechanical model of an atom? (i) The energy of electron in atom is quantized.
(ii) The existence of quantized electronic energy level is a result of the particle property of electrons.
(iii) The path of the electron can be determined accurately.
(iv) In a multi electron atom, the electrons are filled in various orbitals in the order of increasing energy.
(v) The probability of finding an electron at a point within an atom is proportional to the square of the orbital wave function.

Calculate the energy associated with third orbit of $\text{He}^+$.

For hydrogen atom, the orbitals with the lowest energy among the given orbitals are: (i) $4s$ (ii) $2p_x$ (iii) $3d_{z^2}$ (iv) $2p_y$

If \(n,l,m\) and \(s\) represent the symbols of quantum numbers, the impossible quantum number set for the electron in terms of \(n,l,m\) and \(s\) respectively is

Consider the elements with atomic numbers \(Z=1\) to \(Z=20\). The number of elements with only one unpaired electron in their ground state is

Identify the orbital which has lobes not orienting on the axis

If \(n,l,m\) and \(s\) represent the symbols of quantum numbers, the impossible quantum number set for the electron in terms of \(n,l,m\) and \(s\) respectively is

Identify the orbital which has lobes not orienting on the axis

Consider the elements with atomic numbers \(Z=1\) to \(Z=20\). The number of elements with only one unpaired electron in their ground state is

The number of electrons with azimuthal quantum numbers \( l = 1 \) and \( l = 2 \) for Cr in the ground state electronic configurations are respectively. [Given: Cr (Z = 24)]

The electronic configuration of the element with atomic number 78 is :

The orbital described by the quantum numbers \(\mathrm{n} = 4\) and \(l = 2\) is