The electronic configuration of chromium ($Cr$,$Z=24$) is:

The total number of electrons present in all the $p$-orbitals of bromine is

The number of unpaired electrons in $Ni$ (atomic number $= 28$) is:

Give the order of energy of orbitals in a multi-electron atom.

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

Which of the following set of quantum numbers is correct for the $19^{th}$ electron of chromium?
$n$ $l$ $m$ $s$