What is the purpose of the zigzag line on a periodic table

What shape would a molecule with two bound groups and two lone pairs have?

In which block of the periodic table is uranium (u) found? s blockd blockp blockf block

The solid xy decomposes into gaseous x and y: xy(s) m x(g) + y(g) kp = 4.1 (at 0 °c) if the reaction is carried out in a 22.4 l container, which initial amounts of x and y will result in the formation of solid xy?