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.
Use the position in the periodic table and electron configuration to describe the chemical properties of Calcium and Oxygen. Calcium is located in Group 2, and has 2 valence electrons. Oxygen is located in Group 16, and has 6 valence electrons.