(Across a period) shielding effect is
Constant
(Across a period) ionization energy
Increases
(Across a period) electron affinity
Increases
(Across a period) atomic radius
Decreases
(Down a group) electronegativity
Decreases
(Down a group) shielding effect
Increases
(Down a group) ionization energy
Decreases
(Down a group) electron affinity
Decreases
(Down a group) atomic radius
Increases
(Across a period) electronegativity
Increases