IONIC & METALLIC BONDING Flashcards
Explain why ionic substances do not conduct electricity when solid
Because the ions are not free to move so charge cannot flow
Explain why metals are good conductors of electricity
Delocalised electrons can move through the metal and carry charge
Explain in terms of electrons what occurs when lithium reacts with oxygen to form lithium oxide
2 lithium atoms transfer one electron each to one atom of oxygen
The ions have full outer shells
The ions are then attracted to each other by the electrostatic force of attraction
Explain what happens in terms of electrons when magnesium reacts with oxygen to form magnesium oxide
Two electrons 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
If a metal forms an ion , will it have a positive or negative charge?
Positive
Explain why 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
Name the type of structure that is formed when metals and non metals react together
Giant ionic structure
An element is in group 7, if it forms an ion state what charge it will have
1-
If a non metal forms an ion , will it have a positive or negative charge
Negative
Explain why atoms transfer electrons in ionic bonding
To achieve full outer shells
Describe the structure of metals
Giant structure
Metal ions in layers
Delocalised electrons
Give four typical properties of pure metals
High melting and boiling points
Malleable
Good conductors of electricity
Good conductors of thermal energy
Describe the structure of a typical alloy
Metallic structure
With atoms of different metals or carbon mixed in
Describe the structure of a giant ionic lattice
A 3D Network of alternating positive and negative ions held together by the strong electrostatic force of attraction
Explain why ionic substances have high melting points
There is a strong electrostatic force of attraction
Between oppositely charged ions
Which requires a lot of energy to break
