The formula of a compound indicates all of the following except:

the symbols for the atoms
the number of atoms
the ratio of atoms in a compound
the arrangement of the atoms in the molecule

The correct answer is the arrangement of the atoms in the molecule. The formula of a compound indicates all of the other choices except this. 

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Vander waals forces are inter molecular bonds that exist within molecules of the same substance. a water molecule is made up of oxygen and hydrogen atoms which share electrons between each other. the vander waals forces are forces that exist between multitude of different  molecules of water. dipole dipole forces is the type of vander waals force that exist in water. the oxygen atom which is more electronegative pulls the shared electron closer to itself thus generating a partial negative charge while the hydrogen acquire a partial positive charge. these two different charges causes attraction to occur in water molecules.