Question

Why is the first ionization energy of colbat slightly larger than that of iron?

Answer 1

Answer:

It doesn't take much energy to remove one electron from a sodium atom to form an Na+ ion with a filled-shell electron configuration. ... The first ionization energy of magnesium is larger than sodium because magnesium has one more proton in its nucleus to hold on to the electrons in the 3s orbital.

Answer 2

Answer:

The number of unpaired elections in iron is more than cobalt. The screening effect is less tham Iron and that's why its ionization potential is more than cobalt.