The woman behind the isotopeMeticulous work by chemist Stephanie Horovitz, who purified and measured the atomic weights of lead chloride, revealed the first direct evidence for the existence of isotopes. She also proved that a recently discovered element – ionium – didn’t exist. Despite long-time support from her supervisor and co-author Otto Hönigschmid, Horovitz’s contribution to chemistry has been almost forgotten. Her death at the hands of the Nazis at Treblinka in 1942 was mourned by her contemporaries, but Horovitz wasn’t even mentioned in a 1946 Nature Obituary of Hönigschmid. Nevertheless, her name lives on in the scientific record of her painstaking work. Chemistry World | 8 min read |
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