Aims

Class work Bonds in Metals

LO’s• How do metals bond?

Write it down!! Page 46© C Meyer

All• Know how atoms in metals are

arranged

Most• List elements with giant metallic

structures

Some• Explain how delocalised electrons hold

metal atoms together

Aims

In back• List 5 metal symbols• List 4 metal properties• List 3 magnetic metals• List 2 metals used in jewellery• List 1 liquid metal at room

temperature

How do metals bond?

Growing metal crystalsExpt 1• Take a boiling tube• Quarter fill with silver nitrate solution• Place a strip of copper wire in the solutionExpt 2• Take another boiling tube• Quarter fill with lead nitrate• Place a strip of zinc foil in the solution• Leave until end of lesson and observe crystals

with hand lens

SAFETYChemicals - goggles

10 mins

How do metals bond?

Tidy UP!!!

• Stack items tidily• Clean up bench/floor• Sit down when finished

• Metals grow as crystals (grains)

How do metals bond?

How do metals bond?

• Metal atoms form a giant lattice similar to ionic compounds.

• Grains grow with atoms coming together in ordered patterns

m1

Types of bonding

Atoms can be joined together in 3 possible ways

All three types involve changes in the electrons in the outermost electron shells of the atoms

Ionic Bonding

Metal and non-metal

Covalent Bonding

Non-metals only

Metallic Bonding

Metals only

• Outer electrons are free to move all over the lattice in a “sea of electrons” (delocalised).

• This leaves metal atoms with a + charge.

• Attraction between - and + acts like a glue

How do metals bond?

m1

What have I learnt?

What type of bonding will the substances have?

Substance Bonding

Brass (Alloy copper + zinc)

Copper oxide

Sulphur dioxide

Iron

Sodium fluoride

Nitrogen chloride

Metallic

Ionic

Covalent

Metallic

Ionic

Covalent

What have I learnt?

Which of the following will have covalent bonding?

A. Sodium chloride

B. Iron

C. Bronze

D. Nitrogen dioxide

What have I learnt?

Which of the following will have metallic bonding?

A. Copper chloride

B. Graphite

C. Bronze

D. Phosphorus chloride

What have I learnt?

Which is a true statement about covalent bonds?

A. Usually formed between metals and non- metals

B. Involve transfer of electrons between atoms.

C. Form full electron shells by sharing of electrons.

D. Always involve 2 electrons per atom.

What have I learnt?

Which of the following exists as a giant molecular structure?

A. Water

B. Carbon dioxide

C. Sodium chloride

D. Diamond

What have I learnt?

What will be the formula of the compound formed by hydrogen and sulphur?

A.HS

B.H2S

C.HS2

D.H2S2

32

S16

1

H1

1 2.8.6

What have I learnt?

• Next lesson end of section test• Prepare a spider diagram/mind

map of all the key facts from this section

• Finish for homework and revise

How do metals bond?

Homework

The End