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.
The elements of Group 17 the halogens are found on the right side of the periodic table between groups 13-16 and group 18. The halogen group periodic table is shown below. The first member of this family is fluorine which is the most reactive and the most electronegative element known.