<P> Chemical structures may be written in more compact forms, particularly when showing organic molecules . In condensed structural formulas, many or even all of the covalent bonds may be left out, with subscripts indicating the number of identical groups attached to a particular atom . Another shorthand structural diagram is the skeletal formula (also known as a bond - line formula or carbon skeleton diagram). In a skeletal formula, carbon atoms are not signified by the symbol C but by the vertices of the lines . Hydrogen atoms bonded to carbon are not shown--they can be inferred by counting the number of bonds to a particular carbon atom--each carbon is assumed to have four bonds in total, so any bonds not shown are, by implication, to hydrogen atoms . </P> <P> Other diagrams may be more complex than Lewis structures, showing bonds in 3D using various forms such as space - filling diagrams . </P>

Which neutral atom has 4 dots in lewis structure