Unstable element

Unstable elements have no stable nuclides. Due to long half-lives, natural occurrences can still exist.

43Tc

Technetiumshiny gray metal

61Pm

Promethiummetallic

83Bi

Bismuthlustrous brownish silver

84Po

Poloniumsilvery

85At

Astatineunknown, probably metallic

Radoncolorless gas

Radiumsilvery white metallic

89Ac

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

90Th

Thoriumsilvery

91Pa

Protactiniumbright, silvery metallic luster

92U

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

93Np

Neptuniumsilvery metallic

94Pu

Plutoniumsilvery white, tarnishing to dark gray in air

95Am

Americiumsilvery white

96Cm

Curiumsilvery metallic, glows purple in the dark

97Bk

Berkeliumsilvery

98Cf

Californiumsilvery

99Es

Einsteiniumsilvery; glows blue in the dark

Tennessinesemimetallic (predicted)

118Og

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