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Radioactive element

Radioactivity is the property of unstable atomic nuclei to spontaneously emit ionizing radiation. The atomic nucleus transforms into another nucleus while emitting particles or changes its state while releasing energy.

Technetiumshiny gray metal

Promethiummetallic

Bismuthlustrous brownish silver

Poloniumsilvery

Astatineunknown, probably metallic

Radoncolorless gas

Radiumsilvery white metallic

Actiniumsilvery-white, glowing with an eerie blue light; sometimes with a golden cast

Thoriumsilvery

Protactiniumbright, silvery metallic luster

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

Neptuniumsilvery metallic

Plutoniumsilvery white, tarnishing to dark gray in air

Americiumsilvery white

Curiumsilvery metallic, glows purple in the dark

Berkeliumsilvery

Californiumsilvery

Einsteiniumsilvery; glows blue in the dark

Tennessinesemimetallic (predicted)

Oganessonmetallic (predicted)

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