D.P. GUPTA, Preetima Bajpai and, Sanjeev Kumar Jha Solutions for Chapter: Atomic Structure, Exercise 1: Exercise 1

Consider the ground state of $\mathrm{Cr}$ atom $(\mathrm{Z}=24)$. The number of electrons with the azimuthal quantum numbers, $\mathrm{\ell }=1$ and $2$ are, respectively:

The number of the unpaired electrons in a nickel atom (ground state) are (Atomic Number of $\mathrm{Ni}=28$):

Which of the following elements outermost orbit's last electron has the magnetic quantum number $\mathrm{m}=0$?

Bohr's model of atom is in conflict with:

A near $\mathrm{UV}$ photon of $300 \mathrm{nm}$ is absorbed by a gas and then re-emitted as two photons. One photon is a red light with the wavelength $760 \mathrm{nm}$, then the wavelength of the second photon is:

If the wavelength of a photon is $2.2\times {10}^{-11} \mathrm{m} \left(\mathrm{h}=6.6\times {10}^{-34} \mathrm{J} \mathrm{s}\right)$, its momentum will be

If nitrogen atom has an electronic configuration of $1{\mathrm{s}}^7$, it would have energy lower than that of the normal ground state configuration, $1{\mathrm{s}}^{2}2{\mathrm{s}}^{2}2{\mathrm{p}}^3$, because the electrons would be closer to the nucleus, yet $1{\mathrm{s}}^7$ is not observed because it violates

According to Bohr's theory, the angular momentum for an electron of the $3^{\mathrm{rd}}$ orbit is