HomeElement listsRadioactivityslightly radioactive

Radioactivity: slightly radioactive

Radioactive elements: The most stable isotope is very long-lived, with a half-life of over four million years.

Technetiumshiny gray metal

Bismuthlustrous brownish silver

Thoriumsilvery

Uraniumsilvery gray metallic; corrodes to a spalling black oxide coat in air

Neptuniumsilvery metallic

Plutoniumsilvery white, tarnishing to dark gray in air

Curiumsilvery metallic, glows purple in the dark

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

Legend

slightly radioactive significantly radioactive highly radioactive radioactive extremely radioactive