Which of the following should be the order of increasing values of second ionization potential of C, N, O.F

Which of the following should be the order of increasing values of second ionisation potential of C_(6),N_(7),O_(8) and F_(9)

The correct order of second ionisation potential of C, N, O and F is:

Which has the highest second ionization potential?

The decreasing order of the second ionization potentials of K, Ca and Ba is

The decreasing order of the second ionization potential of Mg, Ca and Ba is

which of the following elements has the highest value of second ionization energy?

Arrange the following in the order of increasing ionization potential