# Atom Modify

- Element
- Property
- Analysis
- Position
- View

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.
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