2.10

2.10 What three factors affect ionisation energy?

Nuclear charge, electron shielding and distance of the electron from the nucleus

2.10 How does increasing nuclear charge affect ionisation energy?

It generally increases attraction between the nucleus and outer electron

2.10 How does increased electron shielding affect ionisation energy?

It reduces attraction between the nucleus and outer electron

2.10 How does increased distance from the nucleus affect ionisation energy?

It reduces attraction between the nucleus and outer electron

2.10 Why does increased nuclear charge increase attraction?

The nucleus has more protons and therefore a stronger positive charge

2.10 What is electron shielding?

The repulsion/ screening effect of inner-shell electrons on an outer electron

2.10 What happens to first IE down a group?

It generally decreases

2.10 Why does first IE decrease down a group?

The outer electron is further from the nucleus and experiences greater shielding

2.10 What happens to first IE across a period?

It generally increases

2.10 Why does first IE generally increase across a period?

Nuclear charge increases while shielding remains broadly similar because electrons enter the same shell