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, Francium, Fr

, Francium, Fr - . . 1- . , . 87, . . . , . . b-- 223Fr (T1/2 = . 21,8 ). . 235U. 1,6 , , . 24,5 . . 7s1. , . 280 , 0,7, 1,8 .

. . . . - -. . . . 2,3-2,5 /3, t=18-21 o, t=640-660 oC, . cp=31,6 /.K, 2,1 /, 69,1 /. , . . . . 0,45 . ( 291 ).

223Fr . 227, . . 223Fr a- 227, b- 223Fr , a- 227 .

. . .

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