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Actinides

The radioactive bottom row. Mostly lab-made super-heavies, plus uranium, thorium, and plutonium.

Quiz me on actinidesOpen periodic table

The 15 actinides

89Ac

Actinium

Period 7

227.00
90Th

Thorium

Period 7

232.04
91Pa

Protactinium

Period 7

231.04
92U

Uranium

Period 7

238.03
93Np

Neptunium

Period 7

237.00
94Pu

Plutonium

Period 7

244.00
95Am

Americium

Period 7

243.00
96Cm

Curium

Period 7

247.00
97Bk

Berkelium

Period 7

247.00
98Cf

Californium

Period 7

251.00
99Es

Einsteinium

Period 7

252.00
100Fm

Fermium

Period 7

257.00
101Md

Mendelevium

Period 7

258.00
102No

Nobelium

Period 7

259.00
103Lr

Lawrencium

Period 7

266.00
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