radium

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Simple English Wikipedia has an article on:

[change] Pronunciation

  • Hyphenation: ra‧di‧um

[change] Noun

Singular
radium

Plural
none
  1. An element that has an atomic number of 88 and symbol Ra.
    A normal person cannot find radium in any store.
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The Periodic Table
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 Uub Uut Uuq Uup Uuh Uus Uuo
 
alkali metals alkaline earth metals lanthanides Actinides Transition elements Other metals Metalloids Other nonmetals Halogens Noble gases
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