Ionisation Energies

Question 1

What are the features that affect ionisation energy ?

Answer 1

Nuclear charge, atom size, nuclear shielding, the molecule’s orbitals.

Question 2

Is it more difficult to remove an electron from a stable orbital or an unstable orbital?

Answer 2

It’s more difficult to remove an electron from a stable orbital (it takes more energy).

Question 3

Are 1/2 filled orbitals stable ?

Answer 3

Yes