Elements of Life : Bonding

Question 1

When does ionic bonding occur

Answer 1

Between a metal + non metal

Eg. LiCl , Na2O

Question 2

What does ionic bonding involve

Answer 2

Transfer of electrons

Question 3

When does covalent bonding occur

Answer 3

Between 2 non- metals

Eg. O2 , PBr3

Question 4

What does covalent bonding require

Answer 4

Shared pair of electrons

At least one from each atom

Question 5

Definition of dative covalent bonding

Answer 5

Unequal sharing of electrons
One atom donates both electrons

Eg. NH4 +

Question 6

When drawing a dative covalent bond dot cross diagram what must one include

Answer 6

An arrow from the atom donating two electrons

Question 7

Definition of metallic bonding

Answer 7

Positive cations surrounded by a sea of delocalised electrons

Question 8

Definition of ionic bonding

Answer 8

Electrostatic attraction between positive and negative ions

Question 9

Describe cations and anions in terms of there size

Answer 9

Cations = small = looses electrons = loose a shell

Anions = big = gain electrons = don’t loose a shell

Question 10

Describe strength of ionic bonding and what it depends on ( 2 )

Answer 10

1. Greater charge on ion = stronger ionic bonding

2. Smaller ions = stronger ionic bonding

Question 11

When do ions get bigger

Answer 11

As you go down the group

Question 12

What effects strength of metallic bond ( 3 )

Answer 12

1. Smaller metal ion = stronger
2. Greater charge = stronger
3. More delocalised electrons = stronger