Periodicity

Question 1

Trend in atomic radius explained

Answer 1

Decreases
Nuclear charge increases so electrons are more strongly attracted to the positive nucleus so are pulled inwards decreasing atomic radius

Question 2

Trend in first ionistation energy explained

Answer 2

Overall decreases as nuclear charge increases, attractio between the nucleus and electrons increases so outer es require more energy to remove

Two anomalies
Increases between 2 and 3
Increases between 5 and 6

2-3
Outermost electron in g3 is in a higher energy shell than g2 therefore lost more easily

5-6
Outermost electron in 6 is paired therefore mutual repulsion means it is more easily lost