In this feature, molecules are depicted in two ways.
Methane, for example, is written out as CH4. This
shows that the molecule consists of one atom of carbon and
four atoms of hydrogen. The molecule is also expressed as
one "C" and 4 "H's" connected by lines...
These depictions of CH4 and CO2 show
the bonds that hold the atoms together. A single line
indicates that two atoms share one pair of electrons. A
double line indicates that two atoms share two pairs of
electrons.
