Periodic Trends

Question 1

Atomic Radius Across a Period

Answer 1

Decreases

1) Adding protons increases nuclear charge, which increses attraction

Question 2

Atomic Radius Trends Down a Group

Answer 2

Increases

1) adding energy levels with additional electrons increases distance between nucleus and valence electrons
2) increased shielding from core electrons

Question 3

Ionization Energy Accross a Period

Answer 3

Increases

1) size is smaller so nucleus has greater atraction for the electrons

Question 4

Ionization Energy Down a Group

Answer 4

decreases

1)Size is larger, nucleus has a weaker attraction for the valence electrons.

Question 5

Electron Affinity accross a Period

Answer 5

More negative, more exothermic

1)easier to gain, ecloser to noble gas configuration by gaining electrons, smaller size

Question 6

Electron Affinity Down a Group

Answer 6

Less negative, less exothermic

1)large size makes it difficult to gain electrons