Structure and bonding Flashcards
Metallic bonding definition
Electromagnetic force of attraction between positive metal ions and negative delocalised electrons
What are the 3 larger covalent molecular elements?
Phosphorus (P4), sulphur (S8) and fullerene (C60)
What intermolecular forces do covalent molecules have?
London dispersion forces
Covalent molecules have _____ boiling points
Low
Sulphur, phosphorus and fullerene have higher melting points than other covalent molecules because…
They have heavier molecules and have more electrons than the lighter molecules so have stronger London dispersion forces.
Covalent networks have very ____ melting points
High
Boron, carbon (excluding fullerene form) and silicon are…
Covalent network elements
Diatomic molecules, phosphorus and silicon are…
Discrete covalent molecules
Monatomic elements are held together by…
Weak London dispersion forces
Monatomic elements are Nobel gasses and have very ____ melting points
Low
As you go down the Nobel gases the LDF get _____ due to ___________
Stronger, an increased number of electrons
