born-harbour cycle

• enthalpy formation - the enthalpy change when one mole of a compound is formed under standard conditions
• second ionisation enthalpy - an electron is removed from each atom in a mole of gaseous atoms to form a mole of a gaseous atoms with a +1 charge
• enthalpy of atomisation - change when 1 mole of gaseous atoms are formed from the element in its standard state
• bond association enthalpy - enthalpy change when one mole of a covalent bond is broken into 2 gaseous atoms
• electron affinity - when each atoms in 1 mole of gaseous atoms gain 1 electron to produced 1 mole of gaseous -1 ions
• enthalpy of hydration - when 1 mole of a gaseous ions turns into an aqueous ion
• lattice enthalpy of formation has a negative charge but lattice enthalpy of dissociation has a positive charge
• lattice enthalpys are dictated by the: size of ions and charge of ion
• key points of perfect ionic model : . ions are perfect spheres . the bonds are 100% ionic . purely electrostatic attraction