Perey named the new isotope actinium-K (it is now referred to as francium-223) and in 1946, she proposed the name catium (Cm) for her newly discovered element, as she believed it to be the most electropositive cation of the elements.
Perey a numit noul izotop actiniu-K (acum denumit franciu-223) iar în 1946, ea a propus numele catiu pentru elementul nou descoperit, fiindcă ea îl credea a fi cel mai electropozitiv cation dintre elemente.