Element. 



First Group : 

 Ur 

 * 

 UrX 



Ionium 



4- 



Ra 



4- 



Emanation 



1 



RaA 



RaB 



RaC 



RaD 



RaE 



RaF 



Inactive Product 



Atomic 

 Weight. 



238-5 



(234-5) 

 (230-5) 

 226-5 

 (222-5) 

 (218-5) 



(214-5) 



(2I4 - S) 



(210-5) 



(210-5) 



(210-5) 



(206-5) 

 Cp. lead = 207 



Half-Life 

 Period. 



Nature of Exaggerated 

 Emitted Graphic 



Rays. Representation 



22 days 



1300 years \ 

 or 164 ,, / 

 3 "8 days 



3 minutes 



21 ,, 

 28 „ 

 40 years 

 6 days 

 143 » 



a(3y 



rayless 



aPy 

 rayless 



Py 



a 



rayless 



Third Group : 

 Act 



Radioactinium 



4- 



ActX 



4- 



Emanation 



4- 



Act A 



; 



ActB 



4- 



ActC 



4- 



Inactive Product 



19-5 days 

 10-2 „ 



3-9 seconds 

 36 minutes 



2-15 „ 



rayless 



a 

 a ((3?) 



a 



rayless 



a/3 y 



rayless 



Ooi. 



>o<*. 



•ax. 



■o°c 



Ooc 



Ooc 



o . 



» 



