Ionization energy (I. E.) is the energy required to remove an electron from a gaseous atom or ion.
• First I.E. corresponds to removing the first valence electron from a neutral atom
• Second I.E. refers to removing a second electron
• Third I.E. refers to removing the third electron
Since we are removing an electron (e-), it should be on the product side when written in a reaction equation (since the atom is “losing” the electron).
When removing an e-:
• in a neutral atom → will gain a positive (+) charge become a cation (positively charged ion)
• in an ion → will add a positive (+) charge to the current charge
First ionization energy → removing the first valence electron from neutral Br
Part A - Trends in Ionization Energy
The third ionization energy of bromine is the energy required for which of the following processes?
a) Br(g) → Br+(g) + e-
b) Br+(g) → Br2+(g) + e-
c) Br(g) → Br2+(g) + 2 e-
d) Br(g) → Br3+(g) + 3 e-
e) Br2+(g) → Br3+(g) + e-
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