1I- Periodicity

Question 1

What happens to atomic radius across period 3 from Na-Ar

Answer 1

Decreases, number of protons increases, more attraction to nucleus

Question 2

Trend in first ionisation energy across period 3 Na-Ar

Answer 2

Increases, number of protons increase, similar amount of shielding

Question 3

Trend in melting and boiling points across period 3 Na-Ar

Answer 3

Increase from Na-Al, charge on ion increases, stronger metallic bonds, metals have giant structures, higher mps and bps
Decrease from P-Ar, simple molecular structures, weak van der waals
Si- crystal structure so high mps and bps