The energy required to pull the most loosely bound electron form an atom is known as ionizatino potential it is expressed in electron volts. The value of ionization potntial depends on three factors: (i) the charge on the nucleus (ii) the atomic radius and (iii) the screening effect of inner electron shells.
Q. Incorrect order of ionisation energy is:

Options

A. Pb (I.E.) gt Sn (I.E.)
B. `Na^(+) (I.E.) gt Mg^(+) (I.E.) `
C. `Li^(+) (I.E.) lt O^(+) (I.E) `
D. `Be^(+), (I.E.) lt C^(+) (I.E.)`

Answer

C

Explanation

I.E of `Li^(+) gt O^(+)` as more `Z_(eff)` in case of `Li^(+)`