KA2- Structure And Bonding In The First 20 Elements

Question 1

Metallic bonding

Answer 1

Consists of positive metal ions surrounded by a pool of delocalised electrons
Strong attraction
High melting points ( loads of energy required to overcome the strong metallic bonds)
Conduct electricity ( electrons free to move )

Question 2

Covalent bonding

Answer 2

Intramolecular forces (bonds within the molecule) are covalent
Intermolecular forces are the very weak London dispersible forces
Low melting and boiling points

Question 3

Covalent network elements

Answer 3

Many more atoms joined by covalent bonds
Very high melitng points

Question 4

Monatomic elements

Answer 4

When solid- held together by weak London dispersible forces,
Low melting points because because weak forces
Melting points increase as you descend the group because LDF become stronger due to increased number of electrnos