Paper 2 · periodicity / ionization energy
The first ionisation energy of an element is the energy required to remove
Aone electron from an atom in the solid state
Bone mole of electrons from one mole of gaseous atoms
Cone mole of electrons from one mole of gaseous ions
Dall the outer electrons from one mole of gaseous atoms
Explanation: It refers to one mole of gaseous atoms each losing one electron to give one mole of gaseous singly charged positive ions.
Derived from ZIMSEC Chemistry Paper 2, November 2007, Q1
