Elements

element entries are needed only when defining custom elements that are not standard chemical elements, or defining specific isotopes.

The fields of an element entry are:

symbol

The symbol used for the element, as used when specifying the composition of species.

atomic-weight

The atomic weight of the element, in unified atomic mass units (dalton).

atomic-number

The atomic number of the element. Optional.

entropy298

The standard molar entropy of the element at 298.15 K. Optional.