libelemental-dev binary package in Ubuntu Focal amd64

 gElemental is a GTK+ periodic table viewer that provides detailed information
 about chemical elements.
 .
 It features a table view which allows the elements to be coloured thematically
 by several properties, a sortable list view and an element properties
 dialog, displaying a variety of information, including historical,
 thermodynamic, electrochemical, and crystallographic properties.
 .
 This package contains the development libraries and headers.

Source package