IONIC & METALLIC BONDING Flashcards
Give 2 properties of ionic substances
High melting and boiling points
Only conduct electricity when molten or in solution
Describe what happens to electrons in ionic bonding
They are transferred from one atom to another
If an atom gains electrons, state the type of charge it will have
Negative
If an atom loses electrons, state the type of charge it will have
Positive
Describe the structure of metals
Giant structure
Metal ions in layers
Delocalised electrons
Explain why ionic substances have high melting points
There is a strong electostatic force of attraction
Between oppositely charge ions
Which requires a lot of energy to break
Name the type of structure that is formed when metals and non metals react together
Giant ionic structure
Give 4 typical properties of pure metals
High melting and boiling points
Malleable
Good conductors of electricity
Good conductors of thermal energy
Explain why ionic substances conduct electricity in solution
Because the ions are free to move, so charge can flow
Explain in terms of electrons what occurs when magnesium reacts with oxygen to form magnesium oxide
Two electrons are transferred from a magnesium atom to an oxygen atom
The ions have full outer shells
The ions are then attracted to each other by the electrostatic force of attraction
Explain why metals are good conductors of electricity
Delocalised electrons can move through the metal and carry charge
Name the two different types of substances that from ionic bonds when they react together
Metals and non metals
Explain why atoms transfer electrons in ionic bonding
So the atoms can have full outer shells
Explain why pure metals have high melting and boiling points
Strong metallic bonds between metal ions and delocalised electrons
Require a lot of energy to overcome
Explain why alloys can be harder than pure metals
They have atoms of different sizes
Which distorts the layers of the structure
And prevent them from sliding over each other easily
Explain why ionic substances do not conduct electricity when solid
Because the ions are not free to move so charge cannot flow
DIAGRAMS
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