Change here the element and type of an atom (or list of atoms, previously
selected with Atom->Select, when 
Global is pressed).
Parameters for empty entries or 
Local choices remain unchanged.
To change the atom name write the new name in the Atom entry, followed 
by the atom number (GAMGI only needs the number to identify the atom).
Name
Change here the element name, which can be 
Si but 
not 
si, 
S i or 
SI. When a valid name is entered,
the element number is automatically set and default values are 
suggested for the atom name, type, mass, radius and color. Choosing
a new element automatically changes these values to the new element.
Selecting non-default values for these parameters should therefore 
be done only after setting the element.
Number
Change here the element number, which can vary between
0 (Du, a dummy atom) and 111 (Rg, currently the last element with
a two-letter symbol). When a valid number is entered,
the element name is automatically set and default values are 
suggested for the atom name, type, mass, radius and color, 
as described above.
Type
Change here the atom type, commonly used in Molecular
Mechanics to distinguish atoms described by different inter-atomic
potentials. For example, methyl and hydroxyl hydrogen atoms in methanol
molecules might be described by "h3" and "ho" atom types. Atom types
can have a maximum of 20 characters, accepted characters are the
same as for atom names.
Table
Pressing 
Table pops up a second window, showing a Periodic
Table of the Elements, with a button for each element. When an element
button is clicked, default data is transported to the first window,
exactly as if the user had written the element name in the 
Name 
entry or the element number in the 
Number entry.
Pressing 
Table again (or clicking 
Cancel in the second
window, or using the Window Manager tools) closes the second window.