ES - CI2.5 Atoms and Ions

First Ionisation Enthalpy

• Certain energy will mean an electron is lost from an atom and it becomes a +ve ion = ionisation
• One electron is pulled off = first ionisation enthalpy
• Definition = energy needed to remove one electron from every atom in one mole of isolated gases atoms of the element

General equation:

X(g) = X+(g) + e-

• X =…