First 115 words of the document:
1. Metallic bonding is the strong electrostatic attraction between a sea of delocalised electrons
and close packed positive metal ions.
2. Metals often have high melting points and boiling points because of the strong attraction
between the delocalised electrons and the positive metal ions needs to be broken to melt
3. Metals conduct electricity because the delocalised electrons can move easily.
4. There are some drawbacks of present day superconductors.
They only work at very low temperatures
Scientists and need to develop superconductors that will work at or above [choos one
from 20 oC / 100 oC / 0 oC]. (so they can be used at room temperature)