Periodicity

Question 1

What are the features of group 2 elements?

Answer 1

Silver metals (form an oxide layer)
Form white compounds
Higher melting points than group 1
Harder and denser than group 1

Question 2

What are the name of group 2 elements?

Answer 2

Alkaline earth metals

Question 3

What are the name of group 7 elements?

Answer 3

Halogens

Question 4

What are the physical properties of group 7 elements?

Answer 4

Low melting and boiling points

Exist as diatomic molecules

Boiling points increase as you go down the group

Question 5

Why do the boiling points of the halogens increase as you go down the group?

Answer 5

As you go down the group, the number of electrons increases, increasing induced dipole-dipole forces between molecules.

Question 6

What is the appearance of fluorine?

Answer 6

Colourless gas

Question 7

What is the appearance of chlorine?

Answer 7

Pale green gas

Question 8

What is the appearance of bromine?

Answer 8

Orange solution

Question 9

What is the appearance of iodine?

Answer 9

Purple-black solid

Question 10

Why are halogens more soluble in cyclohexane than in water?

Answer 10

Halogens are more soluble in cyclohexane because they are both non-polar and like dissolves like. Whereas water is a polar molecule.