Problem: Part A - Trends in Ionization EnergyThe 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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Ionization energy (I. E.) is the energy required to remove an electron from a gaseous atom or ion.

First I.E. corresponds to removing thfirst 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

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Problem Details

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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