https://www.mytutor.co.uk/answers/27564/A-Level/Chemistry/How-does-the-first-ionization-enthalpy-change-down-group-2
How does the first ionization enthalpy change down group 2? | MyTutor
First ionization enthalpy is the energy required to remove one electron from each atom in one mole of gaseous atoms, forming one mole of gaseous 1+ ions. The...
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