Trends

Question 1

Electronegativety

Answer 1

is how strongly an element attracts a bonding pair of electrons.

Question 2

Electronegativity as you go down

Answer 2

Electronegativity decreases as you go down Group 7.

This is because atomic radius increases and so electrons experience less attraction to the nucleus.

Electrons become further away from the nucleus and so experience a lower attraction.
This means that the electronegativity is lower.

Question 3

Bp as you go down group 7

Answer 3

Boiling points increase down the group.

This is because elements have more electrons as you go down Group 7.

This causes an increase in van der Waals forces.

Stronger van der Waals forces means greater intermolecular forces.

This means a higher boiling point.

Question 4

Solubility of ammonia

Answer 4

Solubility of ammonia decreases

Question 5

States from top to bottom

Answer 5

Gas to solid

Question 6

Reactivity down group 7

Answer 6

Decreases

As you go down atomic radius is larger
Harder to attract electrons

Question 7

Oxidising ability down the group

Answer 7

Decreases

Atomic radius increases
Less attraction
Easier to lose electron and harder to gain it

Question 8

Power as a reducing agent down the group

Answer 8

Increase as

As we go down the group the ionic radius increases.

The distance between the nucleus and outer electrons becomes larger and there is more shielding. The attractive
force gets weaker.

The outer electron is lost more readily