0973 02 Atoms, elements and compounds SUPPLEMENT 2

Front

Explain why graphite conducts electricity and thermal energy (heat).

Back

Each carbon atom in graphite forms three covalent bonds with three other carbon atoms. One outer shell electron in each carbon isn't in a covalent bond, these electrons are delocalised. The delocalised electrons can move and carry an electrical charge and thermal energy (heat).

Front

Explain why graphite conducts electricity

Back

Has delocalised electrons between the layers that can move through the graphite

Front

What is an "ionic bond"?

Back

The strong electrostatic attraction between oppositely charged ions

Front

What is the giant lattice structure of ionic compounds?

Back

a regular arrangement of alternating positive and negative ions.

Front

What type of ions do metals form when they react?

Back

Metals form positive ions (cations) when they react

Front

Why do atoms transfer electrons in ionic bonding?

Back

So that their outer electron shell becomes full

Front

When are ionic compounds formed?

Back

when a metal reacts with a non-metal and electrons are transferred

Front

How are electrons transferred between atoms when a metal reacts with a non-metal?

Back

metal atoms lose electrons from their outer shell, the non-metal atoms gains those electrons

Front

Explain in terms of electrons what occurs when sodium bonds with chlorine

Back

One electron is transferred from sodium to chlorine

Front

Explain in terms of electrons what occurs when lithium bonds with fluorine

Back

One electron transferred from lithium to fluorine