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There are 6 clues with the answer 'PROTACTINIUM'
# CLUE
1.
Radioactive metallic element of the actinide series occurring as a decay product of uranium; atomic no. 91 (12)
2.
Metallic element isolated by William Crookes in 1900 (12)
3.
Toxic radioactive metallic element; symbol: Pa (12)
4.
Toxic, radioactive metallic element; symbol Pa (12)
5.
PA
6.
Radioactive metallic element discovered by Kazimierz Fajans and Oswald Helmuth Gohring in 1913 and originally named brevium (12)