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| | | | Nature of | Chemical and Physical properties |
| Products |λ(sec)^{-1}| T | the rays | of the product |
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|Uranium | — | — | α |Soluble in excess of ammonium |
| [v] | | | | carbonate, soluble in ether. |
|Uranium X | 3·6 × 10^{-7} | 22 days | β and γ |Insoluble in excess of ammonium |
| | | | | | carbonate, soluble in |
| [v] | | | | ether and water. |
| ? | — | — | — | |
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|Thorium | — | — | α |Insoluble in ammonia. |
| [v] | | | | |
|Thorium X | 2·0 × 10^{-6} | 4 days | α |Soluble in ammonia and water. |
| [v] | | | | |
|Emanation | 1·3 × 10^{-2} | 53 secs. | α |Chemically inert gas of heavy |
| | | | | | molecular weight. Condenses |
| | | | | | at -120° C. |
| [v] | | | |} Deposited on bodies; |
|Thorium A | 1·74 × 10^{-5} | 11 hours | no rays |} concentrated on the cathode in |
| | | | | |} an electric field. Soluble in |
| [v] | | | |} some acids; Th A more volatile |
|Thorium B | 2·2 × 10^{-4} | 55 mins. |α, β, γ|} than Th B; shows definite |
| | | | | |} electro-chemical behaviour. |
| [v] | | | | |
| ? | — | — | — | |
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|Actinium | — | — | no rays |Insoluble in ammonia. |
| [v] | | | | |
|Actinium X | 7·8 × 10^{-7} |10·2 days | α (and β?) |Soluble in ammonia. |
| [v] | | | | |
|Emanation | ·17 |3·9 secs. | α |Behaves like a gas. |
| | | | | | |
| [v] | | | |} Deposited on bodies; concentrated|
|Actinium A | 3·2 × 10^{-4} | 36 mins. | no rays |} on the cathode in an electric |
| | | | | |} field, soluble in ammonia |
| [v] | | | |} and strong acids; volatilized |
|Actinium B | 5·4 × 10^{-3} |2·15 mins.|α, β, γ|} at a temperature of 100° C., |
| | | | | |} A and B can be separated by |
| [v] | | | |} electrolysis. |
| ? | — | — | — | |
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|Radium | — |1300 years| α |Allied chemically to barium. |
| [v] | | | | |
|Emanation | 2·1 × 10^{-6} | 3·8 days | α |Chemically inert gas of heavy |
| | | | | | molecular weight; condenses |
| [v] } Active | | | | at -150° C. |
|Radium A } deposit| 3·85 × 10^{-3} | 3 mins. | α |} Deposited on surface of bodies; |
| [v] } of | | | |} concentrated on cathode in |
|Radium B } rapid | 5·38 × 10^{-4} | 21 mins. | no rays |} electric field; soluble in |
| [v] } change | | | |} strong acids; B volatilized at |
|Radium C } | 4·13 × 10^{-4} | 28 mins. |α, β, γ|} about 700° C., A and C at about |
| [v] | | | |} 1000° C. |
|Radium D } Active | — | about 40 | no rays |Soluble in acids; volatile below |
| [v] } deposit| | years | | 1000° C. |
|Radium E } of | 1·3 × 10^{-6} | 6 days | β and γ |Non-volatile at 1000° C. |
| [v] } slow | | | | |
|Radium F } change | 5·6 × 10^{-8} | 143 days | α |Deposited on bismuth from |
| [v] | | | | solution; volatile at about |
| ? | — | — | — | 1000° C., same properties as |
| | | | | radio-tellurium and polonium. |
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Page:Radio-activity.djvu/471
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