# Atom Create

- Type
- Property
- Analysis
- Position
- View

### mass

Set the atom mass. When not indicated, GAMGI uses the default for the atom element: the mass average of the various isotopes weighted by their natural abundance, indicated in http://www.webelements.com/. To see the default, just select the Periodic Table from Atom->Create, Atom->Modify or Atom->Config, and then select the element. To change the default select Atom->Config and read Help->Topics->Formats->Config->Atom.

    Example: <atom mass="15.9994" element="O" ... /> (default O mass)
    Allowed values: positive real, element name (optional)

### radius

Set the atom radius. When not indicated, GAMGI uses the default for the atom element: the half-distance between atoms in the most abundant natural form, indicated in http://www.webelements.com/. To see the default, just select the Periodic Table from Atom->Create, Atom->Modify or Atom->Config, and choose the element. To change the default select Atom->Config and read Help->Topics->Formats->Config->Atom.

    Example: <atom radius="0.6037" element="O"/> (default O radius)
    Allowed values: positive real, element name (optional)

### charge

Set the atom charge. When not indicated GAMGI uses 0.0 as default.

    Example: <atom charge="0.0" element="O"/> (default 0.0)
    Allowed values: real (optional)

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