2.1 Periodicity

Question 1

Why, in period 3, do boiling and melting points tend to be higher on the left?

Answer 1

Because they form large structures of metallic lattices or macromolecular structures.

Question 2

What is the trend for atomic radii across a period and why?

Answer 2

They decrease in size as the nuclear charge increase while the electron shield remains the same.

Question 3

What is the trend for atomic radii down a group and why?

Answer 3

They increase in size as the electron shielding increases.