Francium and hafnium, two seemingly unrelated elements but linked in my choice of designs by a flower, the simple white and yellow daisy, or marguerite.
Hafnium, element 72, was discovered in Copenhagen (Latin name Hafnia), capital of Denmark. The daisy is Denmark’s national flower and favourite of Queen Margrethe.
Francium, as you might have guessed, was discovered in France, by Marguerite Perey of the Curie Institute in Paris. It is element 87 and the heaviest of the alkali metals.
These two elements have something more significant in common in that they were two of the last three naturally-occurring elements to be discovered: hafnium in 1923 and francium in 1939, with rhenium between the two in 1925.