Periodicity

Question 1

Down a group

Answer 1

Ionisation energy decreases
Electron moved from higher principal energy level
More shielding
Less energy required to remove electron

Question 2

Across a period

Answer 2

Ionisation energy increases
Number of protons increases
Shielding is constant
More energy required to remove electron

Question 3

Successive ionisation energy

Answer 3

Successive I.E increases
More difficult to remove an electron from a more positive ion
Ionic radius decreases
Nuclear attraction to outer electron increases

Question 4

Group 3 deviation

Answer 4

Ionisation energy decreases
Electron removed from higher P- sub level
Less energy required to remove electron

Question 5

Group 6 deviation

Answer 5

Ionisation energy decreases
Pair of electrons in P orbital
Extra repulsion
Less energy required to remove electron

Question 6

Group 6 deviation

Answer 6

Ionisation energy decreases
Pair of electrons in P orbital
Extra repulsion
Less energy required to remove electron