The third ionization energy of bromine is the energy required for which of the following processes?

br(g) ? br+(g) + e?
br+(g) ? br2+(g) + e?
br(g) ? br2+(g) + 2e?
br(g) ? br3+(g) + 3e?
br2+(g) ? br3+(g) + e?

Explanation:

1) The first ionization energy is the energy required to release an electron from a gas neutral atom.

Hence, this is the energy required for this process:

2) The second ionization energy is the energy required to release an electron from a gas ion with charge 1+.

Hence, this is the energy required for this process:

3) The third ionization energy is the energy required to release an electron from a gas ion with charge +2.

Hence, this is the energy required for this process:

"record the time to complete a chemical reaction" would most likely be part of a lab procedure.