Which atom with respect to electronic configuration has more stability?

Explain the oxidation states of chlorine with respect to its electronic configuration

Electronic configuration of Sodium atom is

Which of the following electronic configuration is not possible?

To what extent do the electronic configurations decide the stability of oxidation states in the first series of the transition elements? Illustrate your answer with examples.

Which of the following electronic configuration of an atom has lowest Ionisation enthalpy?

Which element has pseudo inert gas electronic configuration ?

Which of the following electronic configuration corresponds to an inert gas?

Which of the following electronic configuration corresponds to an inert gas ?