Group 2

Question 1

What are group 2 elements

Answer 1

Alkaline earth metals

Question 2

What happens to the atomic radius as you go down the group

Answer 2

Atomic radius gets larger
1 extra electron shell added as you go down

Question 3

What are ionisation energies

Answer 3

Energy required to remove an electron

Question 4

How are ionisation energies affected as you go down the group

Answer 4

Decreases
Each element has extra shell going down, less energy required to remove it -> less nuclear attraction and more shielding

Question 5

What happens to nucleus charge as you go down group

Answer 5

Positive charge increases
Due to extra protons
But this effect is overridden by extra shells

Question 6

What happens to the reactivity of elements going down group

Answer 6

Increases
Easier to remove outer electrons
More shells

Question 7

What happens to melting point as you go down the group

Answer 7

Decrease
Metal ions get bigger as you go down
Larger the atomic radius the further the delocalised electrons are from the positive nuclei
Takes less energy to break bonds
Except magnesium, which has a crystal structure

Question 8

What happens when group 2 elements react with water

Answer 8

The elements re oxidised from state 0 to +2

Question 9

Oxidation state of M

Answer 9

M -> M2+ + 2e-
0 -> +2

Question 10

M reacting with H2O

Answer 10

M + 2H2O -> M(OH)2 + H2
0 -> +2

Question 11

Solubility of compounds

Answer 11

Double charged negative ion = decrease solubility down group
Singly charged negative ion = increase
E.g. = OH- increases SO4^2- decreases