The most commonly used diagnostic tool for tuberculosis is a simple skin test, though blood tests are becoming more commonplace. A small amount of a substance called PPD tuberculin is injected just below the skin of your inside forearm. You should feel only a slight needle prick.
The structure has a double bond and an adjacent atom with a lone pair, so it could have resonance. The possible resonance structures are below. The first structure has the most common bonding pattern for all of its atoms, so it is a reasonable Lewis structure.
Resonance Structures. Resonance Structures. The Lewis structure of ozone (O 3). 1. Sum of valence electrons = (6*3) = 18. 2. Drawing the bond connectivities: 3. Complete the octets of the atoms bonded to the central atom: 4. Place any leftover electrons (18-16 = 2) on the central atom: 5.