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:
symbolThe symbol used for the element, as used when specifying the composition of species.
atomic-weightThe atomic weight of the element, in unified atomic mass units (dalton).
atomic-numberThe atomic number of the element. Optional.
entropy298The standard molar entropy of the element at 298.15 K. Optional.