Melting Points

Question 1

Melting point down group 2

Answer 1

Decrease

Question 2

What do group 2 elements form

1

Answer 2

Metallic structure

Question 3

Metallic structures

2

Answer 3

where you have positive metal ions

attracted to a delocalised negative sea of electrons,

Question 4

Down group 2 size of metal ion

3

Answer 4

increases

but the number of delocalised electrons remains the same.

The charge (+2) remains

Question 5

Larger ions means

4

Answer 5

Larger ions means the distance between the positive nuclei in metal ions and delocalised electrons is greater.

This weakens the attractive force

Question 6

This makes

5

Answer 6

This makes it easier
to break bonds

and hence less energy required.

This leads to lower melting points.

Question 7

Why mp decrease down group 2

Answer 7

Size of metal ion increases

Number if delocalised e- stays the same

Larger ion means the distance between the positive metal ion and delocalised e- is greater

Weakens attractive force

Makes it easier to break bonds and less energy is required to break them.

Question 8

Why is mg an exception

Answer 8

Structural differences