Group 2 Metals

Question 1

What are the trends in atomic radius down group 2 ?

Answer 1

Atomic radius increases down group 2
-shielding increases
-outer electron is further from the nucleus meaning it’s less attracted to

Question 2

What are the trends in melting point down group 2 ?

Answer 2

Melting point decreases down the group
- ionic radius increase
-shells increase
-distance between delocalised electron and positive nucleus down the group increases
-strength of metallic bond decrease
-less energy required to overcome bonds

Question 3

What are the trends in first ionisation energy down group 2 ?

Answer 3

• ionisation energy decreases as you go down the group
  1-atomic radius increase
  2.electron shielding increases
  3. Nuclear charge increase

Question 4

What are the trends in reactivity of group 2 ?

Answer 4

Reactivity increases down the group
-Ionisation energy gets smaller
-shielding increases
-atomic radius increases outer electron are further
-easier to lose electron
-melting point decreases

Question 5

What is two types of reaction with magnesium

Answer 5

Warm water - Magnesium hydroxide

Mg+2H20 —> Mg(OH)2 +H2
-no flame
-slower reaction

Steam -magnesium oxide

Mg(s) + H2O(g) —> MgO(s) + H2(g)
-bright white flame
-MgO - white powder

Question 6

What is the reaction between group 2 elements and cold water

Answer 6

Ca + 2 H2O (l) —>Ca(OH)2 (aq) + H2 (g)
- hydroxides produced make the water alkaline
-observation
-fizzing (more vigrous down the group )
-metal dissolving (faster down the group)
-solution heating up (more down group)

Question 7

What precipitates are formed

Answer 7

Precipitate is a solid
-calcium a white precipitate
-less precipitate down the group is formed

Question 8

What is the reaction with group 2 and oxygen ?

Answer 8

-group 2 burns in oxygen
-mg burns with bright white flame
2Mg+O2 —> 2MgO
- MgO is a white solid with high melting point due to Ionic bond