Giant lattice structure held together by attraction between  positive and negatively charged ions 

• simple covalent molecules
• metallic
• ionic
• giant covalent 

Elements such as  Silicon, diamond and graphite.  Compounds include  SiO₂

• simple covalent molecules
• metallic
• ionic
• giant covalent 

Melting points are very high – a large amount of energy is needed to break all the covalent bonds

• simple covalent molecules
• metallic
• ionic
• giant covalent 

Conducts electricity due to delocalised electrons

• simple covalent molecules

• metallic

• ionic

• giant covalent

Melting points are generally high – lots of energy is needed to overcome the attractions between positive ions and delocalised electrons.  

• simple covalent molecules
• metallic
• ionic
• giant covalent 

Compounds containing a metal and non-metal.

• simple covalent molecules
• metallic
• ionic
• giant covalent 

Covalent compounds

• Share electrons
• transfer electrons
• contain a sea of electrons
• conduct electricity

Which of these is covalent?

• NaCl
• Pb(NO₃)₂
• CO₂
• AlCl₃

Which elements tend to lose electrons?

• metals
• nonmetals

When an atom loses an electron, it becomes a:

• positive ion
• negative ion
• neutral ion
• neutral atom