Melting and boiling points

Question 1

Melting and boiling points depend on …..

Answer 1

Strength of the forces which hold the particles and molecules together - inter molecular forces- not the forces that exist between atoms in a molecule - molecular forces.

Question 2

How do boiling points change across a period

Answer 2

Across a period from left to right the melting and boiling points increase until group 4, after this they plummet. This is due to strong attractions between the atoms in groups 1-4. After this there is a decrease in the forces of attraction between the atoms

Question 3

Melting and boiling points going down groups for group 1 and group 7

Answer 3

In group 1 the melting and boiling points decrease due to the decrease in the forces of attraction between atoms - the opposite is true for the halogens