chemeq DESCRIPTION
 
  Package capable of balance chemical equations and contains most used portion
  of the periodic table of elements.

  The package has two objects: <equation> and <periodic_table>.

  1. equation
     ========
      CLASS that receives as input a chemical equation in the form
      of a string of the shape:
      "reactant_1 + ... + reactant_n  = product_1 + ... + product_n"

      properties
      ----------
          is_balanced
               Boolean (True or False)
          reactants
               pandas.DtataFrame where each row represents one of the reactant
               compounds, Their elements and molecular weights.
          products
               pandas.DtataFrame where each row represents one of the product
               compounds. Their elements and molecular weights.
      Method
      ------
          balance()
               Balances the equation if it is unbalanced.

  2. periodic_table
     ==============
      pandas.DataFrame with data from the periodic table of elements contains:
      Z, name, symbol, atomic mass, atomic mass error, period,  group & state.
      
      Source for the periodic table of elements:
	  IUPAC - International Union of Pure and Applied Chemistry
	  https://iupac.org/what-we-do/periodic-table-of-elements/

LIMITATIONS
  1. Does not include Rare earths, synthetic elements, Rn, Fr & Ra.
  2. Intermediate prefixes like those from hydrates such as Cu(SO4)•5H2O
     must be represented with subindexes like Cu(SO4)(H2O)5.

EXAMPLES
  >>> from chemeq import chemeq
  >>> eq = chemeq("C2H5(OH) + O2 = CO2 + H2O")
  >>> eq.is_balanced
  False

  The balance status of the equation is also visible in
  the equation object itself.
  >>> eq
  <Unbalanced equation: "C2H5(OH) + O2 = CO2 + H2O">

  To balance the equation invoke the balance() method
  >>> eq.balance()
  >>> eq.is_balanced
  True
  >>> eq
  <Balanced equation: "C2H5(OH) + 3O2 = 2CO2 + 3H2O">
  >>> str(eq)
  "C2H5(OH) + 3O2 = 2CO2 + 3H2O"
  >>> eq.reactants
     coefficient   formula  C  H  O  Mass(g/mol)
  0            1  C2H5(OH)  2  6  1       46.069
  1            3        O2  0  0  2       31.998
  >>> eq.products
     coefficient formula  C  H  O  Mass(g/mol)
  0            2     CO2  1  0  2       44.009
  1            3     H2O  0  2  1       18.015
  

  An equation can be created with their indexes to test
  if it is balanced. If it is not it can be balanced later.
  >>> eq = chemeq("CuS + 8HNO3 = CuSO4 + 8NO2 + 4H2O")
  >>> eq.is_balanced
  True
  >>> eq = chemeq("73CuS + 73HNO3 = 11CuSO4 + 11NO2 + 11H2O")
  >>> eq.is_balanced
  False
  >>> eq.balance()
  >>> eq
  <Balanced equation: "CuS + 8HNO3 = CuSO4 + 8NO2 + 4H2O">

  >>> from chemeq import periodic_table
  >>> periodic_table
                      name symbol  atomic_weight   error  group  period state
  atomic_number
  1               Hydrogen      H         1.0080  0.0002      1       1     g
  2                 Helium     He         4.0026  0.0001     18       1     g
  3                Lithium     Li         6.9400  0.0600      1       2     s
  4              Beryllium     Be         9.0122  0.0001      2       2     s
  5                  Boron      B        10.8100  0.0200     13       2     s
  ...                  ...    ...            ...     ...    ...     ...   ...
  79                  Gold     Au       196.9700  0.0100     11       6     s
  80               Mercury     Hg       200.5900  0.0100     12       6     l
  81              Thallium     Tl       204.3800  0.0100     13       6     s
  82                  Lead     Pb       207.2000  1.1000     14       6     s
  83               Bismuth     Bi       208.9800  0.0100     15       6     s
  [67 rows x 7 columns]