Which of the following will have highest difference between `IE_(1)` and `IE_(2)`?

Which of the following Na, Mg, Si and P would have the greatest difference between the IE_(1) and IE_(2) ?

Which of the following has the highest I.E.?Ti,Mn,Fe,Ni

Which of the following molecules has the highest IE (i) Ne (ii) F

Least difference between IE2 and IE1 will be found in:

Least difference between IE2 and IE1 will be found in:

Which among the following elements have the lowest value of IE_(1) ?

Which among the following elements have the lowest value of IE_(1) ?