The correct electronic configuration of $Fe^{3+}$ $[Z=26]$ is:

Under normal conditions,which of the following electronic configurations is able to form a dipositive ion?

In which of the following orbital diagrams are both Pauli's exclusion principle and Hund's rule violated?

The correct set of four quantum numbers for the valence electron of rubidium $(Z = 37)$ is:

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:

If the atomic number of element $X$ is $7,$ the best electron dot symbol for the element is