Periodicity and bonding Flashcards
Metallic bonding definition
The electrostatic attraction between positively charged ions and delocalised electrons.
What increases as the metallic bond gets stronger? Therefore meaning mp/bp increases also.
Number of outer electrons.
LDF definition
The attraction between oppositely charged temporary dipoles and induced dipoles. These are weak and take little energy to overcome.
With reference to intermolecular forces between each atom, explain why krypton has a higher melting point than neon.
To melt Kr and Ne, LDF’s must be overcome.
LDF’s arise when uneven distribution of electrons in an atom.
Kr has more electrons than Ne meaning LDF’s between Kr are stronger.
More energy is required to break= higher mp
what is covalent radii
The size of an atom is measured by it’s covalent radius, half the distance between the nuclei of two covalently bonded atoms.
what is ionisation energy?
The ionisation energy is the energy required to remove one mole of electrons from one mole of atoms in the gaseous state.
Trends of ionisation energy
Increase as you go across a period
electronegativity trends
Increases across a period.
Decrease down a group.
