Group 2 and 7

Question 1

What structure is group 7?

Answer 1

non metal
simple molecular structure
reactive non metals
halide salts found in sea water and salt mines

Question 2

What is the reactivity trend for group 7 down the group?

Answer 2

-reactivity decreases
-greater atomic radius
-more electron shielding
-greater nuclear attraction, but outweighed by above
-more difficult to gain electrons

Question 3

Why do mp and bp increase down group 7?

Answer 3

stronger and more london forces beacuse of a larger surface area and more points of contact, so harder to break bonds

Question 4

Why does ionisation energy decrease down the group in group 2?l

Answer 4

as the atomic radius and shielding increases, decreasing the attraction of the electron to the nucleus

Question 5

Why do mp and bp decrease down group 2?

Answer 5

increased atomic radius and shielding, so metallic bonding is weaker

Question 6

why does reactivity increase down the group?

Answer 6

as ionisation becomes easier, reactivity increases

Question 7

Most soluble element group 2:

Answer 7

Mg
Ca
Sr
Ba

Question 8

Use of magnesium hydroxide:

Answer 8

used in indigestion tablets to neutralise stomach acid

Question 9

Use of Calcium hydroxide:

Answer 9

used to increase pH of acidic soils

Question 10

Why does electronegativity decrease down group 7?

Answer 10

atomic radius and shielding increases