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Radioactivity: radioactive

Radioactive elements: The most stable isotope has a half-life between 800 and 34,000 years.

Radiumsilvery white metallic

Protactiniumbright, silvery metallic luster

Americiumsilvery white

Berkeliumsilvery

Californiumsilvery

H He Li Be B C N O F Ne Na Mg Al Si P S Cl Ar K Ca Sc Ti V Cr Mn Fe Co Ni Cu Zn Ga Ge As Se Br Kr Rb Sr Y Zr Nb Mo Tc Ru Rh Pd Ag Cd In Sn Sb Te I Xe Cs Ba La Ce Pr Nd Pm Sm Eu Gd Tb Dy Ho Er Tm Yb Lu Hf Ta W Re Os Ir Pt Au Hg Tl Pb Bi Po At Rn Fr Ra Ac Th Pa U Np Pu Am Cm Bk Cf Es Fm Md No Lr Rf Db Sg Bh Hs Mt Ds Rg Cn Nh Fl Mc Lv Ts Og

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slightly radioactive significantly radioactive highly radioactive radioactive extremely radioactive