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Periodic Table of Elements

At - Astatine

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Nuclides / Isotopes

Nuc- lide	Atomic Mass	NN	Abun %	Spin	Half Life	DM	DT	BR %	Decay Energy (MeV)
At193		108	Syn		~40ms
At194	193.999	109	Syn		~40ms	α	Bi190		7.310
At195	194.997	110	Syn		0.63s	α	Bi191	>75	7.400
					0.63s	ε	Po195	<25	8.000
At196	195.996	111	Syn		0.253s	α	Bi192	>0	7.200
At197	196.993	112	Syn	9/2-	0.35s	α	Bi193	96	7.100
					0.35s	ε	Po197	4	7.200
meta state 0.052MeV			Syn	1/2+	3.7s	α	Bi193	<=100	7.152
					3.7s	ε	Po197		7.252
At198	197.993	113	Syn	3+	4.2s	α	Bi194	90	6.893
					4.2s	ε	Po198	10	8.800
meta state 0.102MeV			Syn	10-	1s	α	Bi194	84	6.995
					1s	ε	Po198	16	8.902
At199	198.991	114	Syn	9/2-	7.2s	α	Bi195	90	6.780
					7.2s	ε	Po199	10	6.600
At200	199.99	115	Syn	3+	43s	α	Bi196	57	6.596
					43s	ε	Po200	43	7.970
meta state 0.104MeV			Syn	7+	47s	ε	Po200	<=57	8.074
					47s	α	Bi196	43	6.700
meta state 0.335MeV			Syn	10-	3.5s	IT		~84	0.335
					3.5s	α	Bi196	~10.5	6.931
					3.5s	ε	Po200	~4.5	8.305
At201	200.988	116	Syn	9/2-	89s	α	Bi197	71	6.473
					89s	ε	Po201	29	5.850
At202	201.988	117	Syn	2, 3+	184s	ε	Po202	82	7.210
					184s	α	Bi198	18	6.354
meta state 0.000MeV			Syn	7+	182s	ε	Po202	91.3	7.210
					182s	α	Bi198	8.7	6.354
meta state 0.391MeV			Syn	10-	0.46s	IT	At202	99.7	0.392
					0.46s	ε	Po202	0.25	7.602
					0.46s	α	Bi198	0.1	6.746
At203	202.987	118	Syn	9/2-	7.4m	ε	Po203	69	5.060
					7.4m	α	Bi199	31	6.210
At204	203.9873	119	Syn	7+	9.2m	ε	Po204	96	6.480
					9.2m	α	Bi200	3.8	6.070
meta state 0.587MeV			Syn	10-	108ms	IT			0.587
At205	204.986	120	Syn	9/2-	26.2m	ε	Po205	90	4.540
					26.2m	α	Bi201	10	6.020
At206	205.9866	121	Syn	5+	30m	ε	Po206	99.11	5.720
					30m	α	Bi202	0.89	5.888
At207	206.9858	122	Syn	9/2-	1.8h	ε	Po207	91.4	3.910
					1.8h	α	Bi203	8.6	5.873
At208	207.9866	123	Syn	6+	1.63h	ε	Po208	99.45	4.973
					1.63h	α	Bi204	0.55	5.751
At209	208.9862	124	Syn	9/2-	5.41h	ε	Po209	95.9	3.486
					5.41h	α	Bi205	4.1	5.757
At210	209.9871	125	100.	5+	8.1h	ε	Po210	99.82	3.981
					8.1h	α	Bi206	0.18	5.631
At211	210.9875	126	Syn	9/2-	7.214h	ε	Po211	58.2	0.786
					7.214h	α	Bi207	41.8	5.982
At212	211.9907	127	Syn	1-	0.314s	ε	Po212	<0.03	1.754
					0.314s	β^-	Rn212	<2.0E^-6	0.043
					0.314s	α	Bi208		7.829
meta state 0.222MeV			Syn	9-	0.119s	α	Bi208	>99	8.051
					0.119s	IT	At212	<1	0.222
At213	212.9929	128	Syn	9/2-	125ns	α	Bi209		9.254
At214	213.9964	129	Syn	1-	558ns	α	Bi210		8.987
meta state 0.059MeV			Syn		265ns	α	Bi210	<100	9.046
meta state 0.231MeV			Syn	9-	760ns	α	Bi210	<=100	9.218
At215	214.9986	130	Syn	9/2-	0.1ms	α	Bi211		8.178
At216	216.0024	131	Syn	1-	0.3ms	β^-	Rn216	<0.0060	2.003
					0.3ms	ε	Po216	<3.0E^-7	0.469
					0.3ms	α	Bi212		7.949
meta state 0.413MeV			Syn	9-	0.1ms	α	Bi212		8.362
At217	217.0047	132	Syn	9/2-	32.3ms	α	Bi213	99.99	7.202
					32.3ms	β^-	Rn217	0.01	0.740
At218	218.0087	133	Syn		1.5s	α	Bi214	99.90	6.874
					1.5s	β^-	Rn218	0.10	2.883
At219	219.0113	134	Syn		56s	α	Bi215	~97	6.390
					56s	β^-	Rn219	~3	1.700
At220	220.015	135	Syn	3	3.71m	β^-	Rn220	92	3.650
					3.71m	α	Bi216	8	6.050
At221	221.018	136	Syn		2.3m	β^-	Rn221
At222	222.022	137	Syn		54s	β^-	Rn222		4.400
At223	223.025	138	Syn		50s	β^-	Rn223

Nuclide	Potential Parent Nuclides
At193	None known
At194	None known
At195	None known
At196	None known
At197	Fr201 (Syn)
meta state 0.052MeV	None known
At198	Fr202 (Syn) Fr202m (Syn) Rn198 (Syn)
meta state 0.102MeV	None known
At199	Fr203 (Syn) Rn199 (Syn)
At200	Fr204 (Syn) Fr204m (Syn) Fr204m1 (Syn) Rn200 (Syn)
meta state 0.104MeV	None known
meta state 0.335MeV	None known
At201	Rn201 (Syn) Rn201m (Syn)
At202	At202m1 (Syn) Fr206 (Syn) Fr206m (Syn) Fr206m1 (Syn) Rn202 (Syn)
meta state 0.000MeV	None known
meta state 0.391MeV	None known
At203	Fr207 (Syn) Rn203 (Syn) Rn203m (Syn)
At204	Fr205 (Syn) Fr208 (Syn) Rn204 (Syn)
meta state 0.587MeV	None known
At205	Fr209 (Syn) Rn205 (Syn)
At206	Fr210 (Syn) Rn206 (Syn)
At207	Fr211 (Syn) Rn207 (Syn)
At208	Fr212 (Syn) Rn208 (Syn)
At209	Fr213 (Syn) Rn209 (Syn)
At210	Fr214 (Syn) Fr214m (Syn) Rn210 (Syn)
At211	Fr215 (Syn) Rn211 (Syn)
At212	At212m (Syn) Fr216 (Syn) Fr216m (Syn)
meta state 0.222MeV	None known
At213	Fr217 (Syn)
At214	Fr218 (Syn) Fr218m (Syn)
meta state 0.059MeV	None known
meta state 0.231MeV	None known
At215	Fr219 (Syn) Po215 (Syn)
At216	Fr220 (Syn)
meta state 0.413MeV	None known
At217	Fr221 (Syn)
At218	Po218 (Syn)
At219	Fr223 (Natural)
At220	None known
At221	None known
At222	None known
At223	None known
Key: NN = Number of Neutrons Abun % = Natural Abundance (as a percentage) Syn = Synthetic Nuclide (does not occur in nature) DM = Decay Mode α = Alpha emission β^- = Beta emission β^- β^- = Double beta decay β⁺ = Positron emission ε = Electron Capture IT = Isomeric Transition N = Neutron emission P = Proton emission SF = Spontaneous Fission DT = Decays To BR % = Branch Ratio (as a percentage)

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References

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At - Astatine

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