Which element is represented by the symbol 'O'?

The element represented by the symbol 'O' is oxygen. In the periodic table, each element has a unique one- or two-letter symbol, which is often derived from its name in English or Latin. Oxygen is a vital element for life on Earth, as it is essential for the process of respiration in animals and combustion in various chemical reactions. It is found in abundance in the Earth's atmosphere, constituting about 21% of it, and is crucial for many biological and chemical processes.

The incorrect options represent different elements. Osmium, for instance, has the symbol 'Os' and is a dense metal used in various industrial applications. Gold, denoted as 'Au' from its Latin name 'Aurum', is a precious metal valued for its rarity and use in jewelry and electronics. Oganesson, with the symbol 'Og', is a synthetic element that is very rare and has only been produced in particle accelerators. Hence, the symbol 'O' specifically identifies oxygen, which plays a fundamental role in supporting life and various chemical reactions on our planet.