Metallic Bonding, Metals And Alloys, Metals As Conductors Flashcards
(8 cards)
When does metallic bonding take place ?
In metals
Outer electrons in metallic bonding
They are nit attached to any individual atom , they are free to move through the whole structure. These are called delocalised electrons.
What is a metallic bond?
The strong electrostatic force of attraction between the positive metal ions and negative electrons
What is an electrostatic attraction
Am attraction between a,positive object and a negative object.
Why do metals have high melting and boiling points
We have to break the strong metallic bonds requiring a great deal of energy.
Why are metals good conductors of heat and electricity?
The delocalised electrons can move carrying an electric current and thermal energy.
Why can metals be bent and shaped?
The layers of atoms can slide over each other however this means some pure metals aren’t hard enough to be useful.
What is an alloy
A mixture of metals . The different sizes of atoms make it more difficult for the layers to slide over each other this means they are harder than pure metals.
