Chemical Bonding Assignment by Chua Man Chin 2p307

Nitrogen dioxide is formed when two harmless elements, nitrogen + oxygen react together. Nitrogen dioxide is the chemical compound with the formula NO₂. Nitric oxide (NO) is an odorless, colourless gas which is produced during high temperature burning of fuel , for example, in cars and other road vehicles, heaters and cookers. Once it is mixed with air it quickly combines with oxygen, forming nitrogen dioxide (NO₂). Nitrogen dioxide is an important air pollutant because it contributes to the formation of photochemical smog, which can have significant impacts on human health. The main effect of breathing in raised levels of nitrogen dioxide is the increased likelihood of respiratory problems. Nitrogen dioxide inflames the lining of the lungs and it can reduce immunity to lung infections. This can cause problems such as wheezing, coughing, colds, flu and bronchitis. Increased levels of nitrogen dioxide can have significant impacts on people with asthma because it can cause more frequent and more intense attacks. Children with asthma and older people with  heart disease are most at risk. The chemical bond between nitrogen and oxygen is a covalent bond.

Triangle = Oxygen electron                 Circle = Nitrogen electron