:

4.5. һ ?

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4.5. һ ?

. , , Fr, Ac, Tc (. 4.42), Rn (. 4.31), At (. 4.40), Po , . , . , , VIIB , 4 ., , : -99 (e-) Ru-99. 10-9 / U n0 , Mo, Nb Re (. 4.43).

-40, -235, -235, -211 .

, , 100 . 13 Pb 2 He. 4 ., . , .

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