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Administrator<br />

3. Type the information for the new parameter.<br />

4. Close and Save the file.<br />

The new parameter is added to the file.<br />

NOTE: Do not include duplicate parameters. If duplicate<br />

parameters exist in a parameter table it is indeterminate<br />

which parameter will be used when called for in a calculation.<br />

NOTE: If you do want to make changes to any of the<br />

parameters used in Chem3D, we strongly recommend that<br />

you make a back up copy of the original parameter table and<br />

remove it from the C3DTABLE directory.<br />

Color<br />

The colors of elements are used when the Color by<br />

Element check box is selected in the control panel.<br />

To change the color of an element:<br />

• Double-click the current color.<br />

The Color Picker dialog box appears in which<br />

you can specify a new color for the element.<br />

Atom Types<br />

The Atom Types table Atom Types.xml) contains<br />

the atom types for use in building your models.<br />

The Elements<br />

The Elements table (Elements.xml) contains the<br />

elements for use in building your models.<br />

To use an element in a model, type its symbol in the<br />

Replacement text box (or paste it, after copying the<br />

cell in the “Symbol” field to the Clipboard) and<br />

press the Enter key when an atom is selected, or<br />

double-click an atom. If no atom is selected, a<br />

fragment is added.<br />

Four fields comprise a record in the Elements table:<br />

the symbol, the covalent radius, the color, and the<br />

atomic number.<br />

Symbol<br />

Normally you use only the first column of the<br />

Elements table while building models. If you are<br />

not currently editing a text cell, you can quickly<br />

move from one element to another by typing the<br />

first letter or letters of the element symbol.<br />

Covalent Radius<br />

The covalent radius is used to approximate bond<br />

lengths between atoms.<br />

Normally you use only the first column of the Atom<br />

Types table while building models. To use an atom<br />

type in a model, type its name in the Replacement<br />

text box (or paste it, after copying the name cell to<br />

the Clipboard) and press the Enter key when an<br />

atom is selected, or when you double-click an atom.<br />

If no atom is selected, a fragment is added.<br />

Twelve fields comprise an atom type record: name,<br />

symbol, van der Waals radius, text number, charge,<br />

the maximum ring size, rectification type, geometry,<br />

number of double bonds, number of triple bonds,<br />

number of delocalized bonds, bound-to order and<br />

bound-to type.<br />

Name<br />

The records in the Atom Types table are ordered<br />

alphabetically by atom type name. Atom type<br />

names must be unique.<br />

Symbol<br />

This field contains the element symbol associated<br />

with the atom type. The symbol links the Atom<br />

Type table and the Elements table. The element<br />

symbol is used in atom labels and when you save<br />

files in file formats that do not support atom types,<br />

such as MDL MolFile.<br />

652• Parameter Tables <strong>CambridgeSoft</strong><br />

The Elements

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