Ionisation Energies

Question 1

write the first IE of calcium

Answer 1

Ca (g) ——-> ca+ (g) + e-

Question 2

list the 4 factors affecting

Answer 2

1. size of nuclear charge
2. shielding/screening effect
3. distance of electron from nucleus
4. spin pair electron repulsion

Question 3

what does IE do across a period

Answer 3

ionisation energy generally increases across a period

Question 4

what does IE do down a group

Answer 4

ionisation energy generally decreases down the group

Question 5

what happens to FAIE across a period

Answer 5

• nuclear charge increases causing atomic radius to decrease as the outer shell is pulled closer to the nucleus so the distance between the nucleus and outer shell decrease
• shielding by inner electrons is constant as electrons are being added to the same shell
• more energy is required as it becomes harder to remove a shell

Question 6

what happens to IE when you change from one period to the next

Answer 6

• IE decreases greatly between the last element in the previous period and the first one in the next period :
• bc distance from the nucleus increases as another shell is being added
• there’s increased shielding effect bc of newly added shell
• there’s an increase in nuclear charge but its outweighed by the above 2