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Noun: atomic number 91
- A short-lived radioactive metallic element formed from uranium and disintegrating into actinium and then into lead
- protactinium, protoactinium, Pa
Type of: metal, metallic element
Nearest
atomic number 82
atomic number 83
atomic number 84
atomic number 85
atomic number 86
atomic number 87
atomic number 88
atomic number 89
atomic number 9
atomic number 90
atomic number 91
atomic number 92
atomic number 93
atomic number 94
atomic number 95
atomic number 96
atomic number 97
atomic number 98
atomic number 99
atomic physics
atomic pile
atomic number 83
atomic number 84
atomic number 85
atomic number 86
atomic number 87
atomic number 88
atomic number 89
atomic number 9
atomic number 90
atomic number 91
atomic number 92
atomic number 93
atomic number 94
atomic number 95
atomic number 96
atomic number 97
atomic number 98
atomic number 99
atomic physics
atomic pile