Kinetic or potential energy E k equals to 0.5 m v 2 . 5.16.1 Ways of Writing Electronic Configurations Element Simple shell configuration Simple orbital configuration (e.g. Ls 2 2s 2 ) and caffeine (C 8 H 10 N 4 O 2 (caffeine): (8 x C) + (10 x H) + (4 x 14u) + (2 x O) = (8 x 12) + (10 x 1) + (4 x 14) + (2 x 16) = 194 equals 1 cubic decimetre or lOg.dm 3 . What is % of Li in Li 2.