Question

In how many pairs, comparison of IE1 (first ionisation energy) and second ionisation energy pair is opposite?
(1) Be, B
(2) Li, Na
(3) N, O
(4) F, Ne
(5) Ba, Tl
(6) Mg, Al
(7) Zn, Cd
(8) B, Al
(9) C, N

Answer 1

Hey mate,

The first ionization energy is the energy it takes to remove an electron from a neutral atom. The second ionization energy is the energy it takes to remove an electron from a 1+ ion. (That means that the atom has already lost one electron, you are now removing the second.)

Hope it helps.