Ozone (O3) has a total of 18 valence electrons. The central oxygen atom has 6 valence electrons, and each terminal oxygen atom has 6 valence electrons.

To determine the number of unshared and bonding electrons around the central oxygen atom, we can use the following steps:

1. Calculate the total number of valence electrons in the molecule: 6 (central oxygen) + 6 (terminal oxygen 1) + 6 (terminal oxygen 2) = 18 valence electrons.

2. Determine the number of valence electrons used in bonding: Each oxygen-oxygen bond consists of two shared electrons. There are two oxygen-oxygen bonds in ozone, so a total of 4 electrons are used in bonding.

3. Calculate the number of unshared electrons: The remaining valence electrons that are not involved in bonding are considered unshared electrons. In ozone, there are 18 total valence electrons and 4 bonding electrons, so there are 18 - 4 = 14 unshared electrons around the central oxygen atom.

4. Determine the number of bonding electrons: As calculated in step 2, there are 4 bonding electrons around the central oxygen atom.

Therefore, the central oxygen atom in ozone has 14 unshared electrons and 4 bonding electrons.