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.
the four block of periodic table is classified on the base there electonic configuration the group 1 / 1A & amp ; 2 / 2B together with hydrogen form s-block elements.they have 1 / 2 electrons in their outer most shell.the group 3A / 3 to 7A / 17 & amp ; zero group together form P-block they have 3-8 electrons in there outer most oshell.the group 1B ...