1H1.0083Li6.9411Na22.9919K39.137Rb85.4755Cs132.987Fr223
4Be9.01212Mg24.3120Ca40.0838Sr87.6256Ba137.388Ra226
21Sc44.9639Y88.91
57La138.989Ac227
22Ti47.8740Zr91.2272Hf178.5104Rf267
58Ce140.190Th232
23V50.9441Nb92.9173Ta180.9105Db268
59Pr140.991Pa231
24Cr5242Mo95.9574W183.8106Sg271
60Nd144.292U238
25Mn54.9443Tc97.9175Re186.2107Bh274
61Pm144.993Np237
26Fe55.8544Ru101.176Os190.2108Hs269
62Sm150.494Pu244
27Co58.9345Rh102.977Ir192.2109Mt276
63Eu15295Am243
28Ni58.6946Pd106.478Pt195.1110Ds281
64Gd157.396Cm247
29Cu63.5547Ag107.979Au197111Rg281
65Tb158.997Bk247
30Zn65.3848Cd112.480Hg200.6112Cn285
66Dy162.598Cf251
5B10.8113Al26.9831Ga69.7249In114.881Tl204.4113Nh286
67Ho164.999Es252
6C12.0114Si28.0932Ge72.6350Sn118.782Pb207.2114Fl289
68Er167.3100Fm257
7N14.0115P30.9733As74.9251Sb121.883Bi209115Mc288
69Tm168.9101Md258
8O1616S32.0634Se78.9752Te127.684Po209116Lv293
70Yb173102No259
9F1917Cl35.4535Br79.953I126.985At210117Ts294
71Lu175103Lr262
2He4.00310Ne20.1818Ar39.9536Kr83.854Xe131.386Rn222118Og294
Francium
Fr
Rn 7s1
27°C
677°C
Radioactive element, belongs to group 1 of the periodic table. Found in Uranium and Thorium ores. The 22 known isotopes are all radioactive, with the most stable being ²²³Fr. Its existence was confirmed in 1939 by Marguerite Perey.
223pm
218pm
100101102103104105106log(kJ mol⁻¹)
0, +2
Since its isotopes have such short half-lives there are no commercially significant compounds of Francium.
46.892kJ mol⁻¹
0.7PAULING
348pm
Formed by decay of Actinium. Chemical properties similar to Cesium. Decays to Radium or Astatine.
Discovered in 1939 by Marguerite Derey in France
Named for France, the nation of its discovery.
7440-73-5
15kJ mol⁻¹
IsotopeAbundanceHalf Life
212Fr-20min
222Fr-14.2min
223Fr-22min

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Using data from mendeleev.
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