The configuration to second excited state of the element is (O) electronic with `O_(2)` or `P^(-)` or `Cl^(+)` is

Which of the following is the electronic configuration of an atom in its first excited state if that atom is boelectronic with O_(2) ?

The ground state electronic configuration of the element which is isoelectronic with NO^(+) is

Which of the following is the electronic configuration of an atom in its first excited state if that atom is isoelectronic with O_(2) ?

What is the electronic configuration of O^(2-) ion?

What is the electronic configuration of O^(2-) ion?

An electron is in second excited state of H-atom. The number of transitions of the electrons to come to ground state is