What is the pattern in the periodic table for valence electrons and orbital shells of an element?

Which of the following represents the ester functional group? a. -coo- b. -cho c. -cooh d. c=o

How many lone pairs of electrons are on the central atom of no3- and what is the molecular shape? one, trigonal planar zero, trigonal pyramidal zero, trigonal planar one, tetrahedral one, trigonal pyramidal

In general metals get as you move from left to right across the periodic table.