For a $4p$-orbital,the number of radial and angular nodes,respectively,are

An element in $+2$ oxidation state has $24$ electrons. The atomic number of the element and the number of unpaired electrons in it respectively are

If there are $2$ nodal surfaces in the third excited state,find the orbital angular momentum.

In a multielectron atom,which of the following orbitals described by three quantum numbers will have the same energy in the absence of electric and magnetic fields?
$A: n=1, \ell=0, m_{\ell}=0$
$B: n=2, \ell=0, m_{\ell}=0$
$C: n=2, \ell=1, m_{\ell}=1$
$D: n=3, \ell=2, m_{\ell}=1$
$E: n=3, \ell=2, m_{\ell}=0$
Choose the correct answer from the options given below:

What is the difference between the $2s$ orbital of hydrogen and the $2s$ orbital of other multi-electron atoms?

How many values of magnetic quantum number are possible for each value of azimuthal quantum number?