The spreadsheet contains four sheets:

1. Main_Form sheet = main interface, where we enter data. Rows (lines) contain
   names of chem. elements, and we need to enter only the number of atoms
   in the corresponding row.

An element has several rows dedicated to it when its isotopes have significant
isotopic composition (abundance), i.e. each such isotope has its own row.
In such cases, the first row in such group is for the most abundant isotope of
that element. (Of course, you will enter number of atoms in only one of those
rows, usually in the first row.)

Here is the field for the "Frequency Limit", where you enter a number (in Hz)
which will be the upper limit for the displayed subharmonics of resonant
frequency. That will be the maximal frequency displayed in the results.


2. Frequencies sheet = the results of calculation are displayed here. After
   all numbers of atoms have been entered, recalculate the spreadsheet
   (graphical button [Recalculate] ) and switch to this sheet to copy desired
   subharmonic number.


3. User_Defined_AM sheet = use this sheet to calculate resonant frequency of
   an atomic mass (weight) of your own choice (an arbitrary atomic mass).


4. Data sheet = this is the core of this spreadsheet. It keeps table of
   elements (isotopic data), data used in calculations. You would access (use)
   this sheet only in case when you want to change isotopic data for
   an element, or change custom Conversion Factor (more about that below).

The rest three sheets are backup.


Hint:
When several (different or the same) molecules need to be taken into account
and handled as a whole, single unit, then simply count up all the atoms of
the same element (from all molecules). That's a simple add operation.
Then enter (type) the resulting sum (i.e. total number of all atoms of that
particular element, from all molecules) in a row for that element (usually in
the first row for that element) (in column C) .


Info about spreadsheet:

Conversion of Atomic mass to frequency:

Spreadsheet uses calculated 'Conversion Factor', based on the latest
available data for the Planck constant (from Jan 2016) and for the
Avogadro constant (Avogadro number) (from Dec 2015).

If you want to use some other 'Conversion Factor', then enter any
whole number greater than zero in the cell 'G 16' ( named: USE_XCC ).
To use spreadsheet's calculated 'Conversion Factor' again,
just reenter zero ( 0 ) in the cell 'G 16' ( named: USE_XCC ).

How to change custom (other) 'Conversion Factor':

Value for the custom (other) 'Conversion Factor' is located in the
"Data" sheet, in the cell 'L 7' ( named: D_XCC ). It already contains
'Conversion Factor' from the:
http://physics.nist.gov/cgi-bin/cuu/Value?uhz
( 2014 CODATA recommended values ).

To change that value, go (switch) to "Data" sheet,
and enter your Conversion Factor into cell 'L 7' ( named: D_XCC ).
For example, you may enter: =2.2523*(10^23)
To make this change permanent, go back (switch) to "Main_Form" sheet,
click on : [ Clear Data ] button, and 'Save' the file (spreadsheet).


"Data" sheet ( Table of elements - Isotopic data ):

Keeps the data used for frequency calculation (isotopic data), and
Conversion Factor used in formula. All data changes and updates go here.

Sources for isotopic data were "The AME_2012 Atomic Mass Evaluation"
( Dec 2012 ), and "Atomic Weights of the Elements 2013".
Data at:
http://physics.nist.gov/cgi-bin/Compositions/stand_alone.pl
are based on those sources.

Numbers that accompany element's name are (denote) :
= in parenthesis : ( 197 ) = isotope number,
= in brackets : [48 %] = isotopic composition (isotopic abundance of naturally
  occurring isotope), or : [348 kYrs] = half life for that isotope
  (348,000 years), for radioactive and synthetic elements.


"Main_Form" sheet:

When chem. element exists in more than one row ( i.e. has isotopes listed ),
then use only one of those rows ( only 1 isotope ) for entering number of
atoms.

Things you can change here :
= Frequency Limit (maximal value of the displayed subharmonic of the
  fundamental resonant frequency),
= decide on whether to use Conversion Factor calculated here, or to use
  some other Conversion Factor.

Graphical buttons execute macros (to automate operations):

= If you think (or see) that something has been messed up,
  click button named: [ Repair Sheet (formulae) ].
  If this needs to be saved, then click on: [ Clear Data ] button,
  and 'Save' the file (spreadsheet).

= [ Clear Data ] button will erase all entries for the number of atoms.

= Select a cell of interest, click: [ Copy Selected Cell ] button, and
  paste where you need the content of the selected cell copied (transferred).
  Of course, you will want to paste values only, if you are copying the
  results of the calculation.

= Use [ Recalculate ] button just to be sure that spreadsheet has been
  thoroughly recalculated.

= Any  [ H o m e ]  button will drive you to the starting location.


"Frequencies" sheet:

Contains results of calculation.
Get (copy) desired subharmonics from this sheet.

If you think (or see) that something has been messed up,
click button named: [ Repair Sheet (formulae) ].
If this needs to be saved, then go back (switch) to "Main_Form" sheet,
click on: [ Clear Data ] button, and 'Save' the file (spreadsheet).


"User_Defined_AM" sheet:

Use this sheet to calculate resonant frequency of some other atomic mass.
Here, you enter (type) atomic mass of your choice.
Get (copy) desired subharmonics from this sheet.