KEY POINTS ABOUT METALLIC BONDING:
- Metals consist of a giant structure
- Metallic bonds involve 'free electrons'. These delocalised electrons come from the outer shell of every metal atom in the structure
- These electrons are free to move through the whole structure and so metals are good conductors of heat and electricity
- These electrons hold the atoms in a regular stucture
- There are stong forces of electrostatic attraction between the positive metal ions and the negative electrons
- They also allow the layers of atoms to slide over each other, allowing metals to be bent and shaped
REMEMBER: ALLOYS ARE HARDER THAN PURE METALS BECAUSE WHEN ANOTHER METAL IS MIXED WITH A PURE METAL, THE NEW METAL WILL DISTORT THE LAYERS OF METAL ATOMS, MAKING IT MORE DIFFICULT FOR THEM TO SLIDE OVER EACH OTHER. SO ALLOYS ARE HARDER!
Comments
No comments have yet been made