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.
The chalcogens, the oxygen group, is located in column 16 of the periodic table. It contains the elements oxygen, sulfur, selenium, tellurium, polonium, and ununhexium (O, S, Se, Te, Po, and Uuh, respectively). These elements all contain six valence electrons and form 2- ions.
Answer There are 18 groups across the periodic table, and they are numbered 1 through 18. Group 1:Alkali Metals* Group 2:Alkaline Earth Metals Groups 3-12: Transitional Metals Groups 13&14: Unnamed Group 15:Pnictogens or Pnicogens) Group 16: Chalcogens Group 17: Halogens Group 18: Noble Gases *excluding hydrogen (hydrogen is in its own group).