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^Cby
^CDan Harrison

  In the 19th Century Dmitri Mendeleev proposed that chemical elements be 
grouped by their atomic weight.  His subsequent "periodic table" revolutionized 
current day knowledge of chemistry.  Today, we know that the periodic nature of 
the elements is more accurately organized when they are listed by atomic 
number.  This Periodic Law, the principle that the physical and chemical 
properties of the elements recur periodically when they are arranged in 
increasing order of their atomic numbers, is the basis upon which the ^1Periodic 
^1Table of Elements^0 is built.  

^1Selecting an Element^0
 
  You can either type the chemical symbol, use the cursor keys, or use a mouse 
to highlight a specific element.  If you type the chemical symbol, you have 
two seconds from the time you type the first letter to input the second (use a 
space for the second character on single letter symbols.)  Once you are 
positioned on the correct element, press either the <ENTER> key or the left 
mouse button to display detailed information about that element.  To exit the 
program from the main Periodic Table screen, press the <ESC> key or the right 
mouse button. 

^1Selecting Element Detail Information^0
 
  Once an element is selected, the display will change to the element detail 
screen.  This is a screen that contains information about the selected element.  
Again, you can use the cursor keys or mouse to highlight a category to view and 
press the <ENTER> key or left mouse button.  Press the <F1> key or the center 
mouse button (on a three button mouse) to display a help screen. Selecting any 
key except <F1>, <ENTER>, or a cursor key will return to the main periodic 
table screen (this means any key - including the <Shift>, <Control>, or <Alt> 
keys.)  

^1Detailed Categories^0
 
  Selecting a category from the element detail screen displays the detailed 
categories screen.  Pressing any key or mouse button returns to the element 
detail screen.  Details are available for the following categories: 

              Group                        Physical Structure 

              Atomic Number                Chemical Reactions

              Atomic Weight                Discovery

              Number of Protons            Electronegativity

              Number of Neutrons           Oxidation States 

                              Nuclear Reaction

^1Technical Notes^0
  
  Both the PERIODIC.EXE and PERIODIC.SCR files must be in the same directory. 
The program automatically compensates for the monitor type, only the opening 
screen is different with different monitors (EGA monitors have a graphics 
opening screen.)  A Composite monitor may try to display some of the colors in 
a manner which makes the text impossible to read.  If this occurs, use the `M' 
parameter.  If the mouse causes problems (some older Tandy machines), use the 
`N' parameter.  To force an EGA monitor for a monitor not detected by 
PERIODIC, start the program with the `E' paramater.  Any combination of these 
switches (in any case) can be used: 

  PERIODIC M N   or   PERIODIC nM  (case is not important)

   To run this program outside Big Blue Disk, type ^1Periodic^0.

DISK FILES THIS PROGRAM USES:
^FPERIODIC.EXE
^FPERIODIC.SCR


**  The primary sources of information for the opening paragraph are:

^C^1World Book Encyclopedia^0

^C^1Websters Unabridged Dictionary^0