select *; spacefill 23%; wireframe 0.15; color cpk-ball and stick
select *; spacefill 0%; wireframe 0.15; color cpk-wireframe
select *; spacefill only; color cpk-spacefill
~<h5> Ethylene, formula C<sub>2</sub>H<sub>4</sub> is the precursor of polyethylene, a common plastic. Notice that the shape around each of carbon of ethylene is trigonal planar with 120&#176;. The double bond also restricts rotation so that the two trigonal planar planes are co&#8208;planar, i.e. the molecule is completely flat. </h5>
