Quantum Mechanical Model of the Atom

The total number of atomic orbitals in the fourth energy level of an atom is :

Consider the following sets of quantum numbers :

which of the following sets of quantum number is not possible ?

The orientation of an atomic orbital is governed by

The number of orbitals possible for the following quantum numbers is/are

$\mathrm{n}=3,\hspace{0.17em}\hspace{0.17em}\mathrm{l}=2, \mathrm{m}=+2$

The number of spherical nodes in 3p orbitals are

The electron was shown experimentally to have wave properties by

In hydrogen atom, the degeneracy of the level with energy $\frac{-{\mathrm{R}}_{\mathrm{H}}}{9}$ is

How many of these orbitals have maximum orbital angular probability distribution at an angle of $45°$ to the axial direction?

${\mathrm{d}}_{\mathrm{xy}}, {\mathrm{d}}_{{\mathrm{x}}^2-{\mathrm{y}}^2}, {\mathrm{d}}_{\mathrm{yz}}, {\mathrm{d}}_{\mathrm{xz}}, {\mathrm{d}}_{{\mathrm{z}}^2}, {\mathrm{p}}_{\mathrm{x}}, {\mathrm{p}}_{\mathrm{y}}, {\mathrm{p}}_{\mathrm{z}}, \mathrm{s}$

An element undergoes a reaction as shown:
$x+{\mathrm{e}}^{-}\to x^{-}$ energy released $=30.87 \mathrm{eV}$
If the energy released, is used to dissociate $12 \mathrm{g}$ of ${\mathrm{H}}_2$ molecules, equally into ${\mathrm{H}}^{+}$ and ${\mathrm{H}}^{*}$, where ${\mathrm{H}}^{*}$ is an excited state, in which the electron travels a path length equal to four times it's de-Broglie wavelength. Determine the least amount (in moles) of $\text{'}\mathrm{x}\text{'}$ that would be required.
Given: I.E. of $\mathrm{H}=13.6 \mathrm{eV}/\mathrm{atom}$, Bond energy of ${\mathrm{H}}_2=4.526 \mathrm{eV}/\mathrm{molecule}$.

The order of ionization energy

Total number of electrons in subshell is calculated by

For how many orbitals, the quantum numbers $\mathrm{n}=3,\mathrm{l}=2, \mathrm{m}=+2$ are possible?

Which of the following statements is/are correct?

Zeeman and Stark effects can be explained by _________________.

Stark and Zeeman effects can be explained by _________________.

de-Broglie's wavelength of an electron having kinetic energy $2.7\times {10}^{-23} \mathrm{J}$ is $\mathrm{A}\times {10}^{-8} \mathrm{m}$. Then, what is the value of $\mathrm{A}$?

The de-Broglie wavelength of an electron travelling at $\mathrm{x}$percent of the speed of light was found to be $2.42 \stackrel{\mathrm{o}}{\mathrm{A}}$. Then, what is the value of '$\mathrm{x}$'?

The ratio of the velocity of ${\mathrm{SO}}_2$ molecules to the velocity of ${\mathrm{O}}_2$ molecules such that they are associated with de Broglie waves of the same wavelength is