Original post by djhodnett
Explain why the first ionisation energy of helium is very large?
You need to consider the electronic configuration of Helium which is:
- The electrons reside in an orbital that is close to the nucleus
- There is a strong electrostatic force of attraction between the positively charged nucleus and the negatively charged electrons because of this proximity and the fact that these electrons are not shielded
- A lot of energy is therefore required to overcome this attraction in order to remove an electron
Original post by djhodnett
Explain why the first ionisation energy of helium is very large?
Moved to Chemistry section
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