By Posted 16th December 2019 In Poems Caesium2019-12-162020-03-13https://periodictable.group.shef.ac.uk/wp-content/uploads/tuos-periodic-light-1.pngPeriodic Table of Poetryhttps://periodictable.group.shef.ac.uk/wp-content/uploads/tuos-periodic-light-1.png200px200px Want to claim an element? Email Joanna.Buckley@sheffield.ac.uk