Periodicity

Question 1

Definition of ionisation energy

Answer 1

Energy needed to remove 1 electron from each atom in 1 mole of a gaseous atom to form 1+ ions

Question 2

How are macro molecular structures bonded

Answer 2

Covalently bonded

Question 3

How does melting point in molecular structures change with size

Answer 3

Van der waals

Bigger molecule = highest MP

Question 4

Trends in MP across group 3 and explanations

Na Mg Al Si P S Cl Ar

Answer 4

Steady increase through Na, Mg and Al
Metallic bonding

Sharp increase for Si
Macromolecular structure

Sharp drop to P4
Molecular structure

Slight increase to S8
Van der waals

Steady increase through Cl2 to Ar which is monatomic

Question 5

General trend in Ionisation energy across a period

Answer 5

Increase across period

Question 6

When describing Ionisation energy across a period- what to include

Answer 6

1) increase nuclear charge
2) increase proton number
3) decrease in atomic radius
4) mention anomalies (new subshell/ stable P orbital)