Group 2, the alkaline earth metals

Question 1

what happens to atomic radius as you go down group 2

Answer 1

-atomic radius increases down the group
-atoms gain extra shells

Question 2

describe the Ionisation Energy down group 2

Answer 2

-decreases as we go down grouo 2
- more shielding
- so weaker attraction between the nucleus and outer electrons
- outer electrons are further away from the nucleus

Question 3

what happens to the number or protons in group 2 bases on Ionisation Energy

Answer 3

-increase in the number of protons as we go down the group
-However the shielding effect overrides an increase in positive charge

Question 4

describe the trend in melting point as you go down group 2

Answer 4

-generally decreases as we go down the group

-metallic bonding weakens as the atomic size increases

Question 5

reactions with water : Magnesium reacted in steam

Answer 5

Mg(s) + H2O(g) –> MgO(s) + H2(g)

Question 6

reactions with water: Magnesium reacted with warm water

Answer 6

Mg + 2 H2O –> Mg(OH)2 + H2

Question 7

reactions of calcium with water including state symbols

Answer 7

Ca + 2 H2O (l)–> Ca(OH)2(aq) + H2(g)

Question 8

reactions of strontium with water including state symbols

Answer 8

Sr + 2 H2O (l) –> Sr(OH)2(aq) + H2(g)