Patients who waited more than 6 months to receive cataract surgery experienced more vision loss, a reduced quality of life and had an increased rate of falls compared with patients who had wait times of less than 6 weeks.
Group 16 is the oxygen family. It consists of the elements oxygen, sulfur, selenium, tellurium, and polonium. Each has six of the desired eight electrons required for the octet in its highest energy level.
Examples of elements that have allotropes include carbon, oxygen, phosphorus, and sulfur. Allotropes. Oxygen is a chemical element represented by the symbol 'O' and has the atomic number 8. It is the first element in Group VI A of the modern periodic table.ioxygen. Dioxygen (O 2) is the most common form of elemental oxygen. It is a colorless gas at room temperature and forms about 21% of the earth's atmosphere. It exists as a diradical, and is the only allotrope that has unpaired electrons.