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Periodic Table of Elements

Fr - Francium

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Nuclides / Isotopes

Nuc- lide	Atomic Mass	NN	Abun %	Spin	Half Life	DM	DT	BR %	Decay Energy (MeV)
Fr200		113	Syn	3+	19ms	α
meta state			Syn	10-	0.57s	α
Fr201	201.004	114	Syn	9/2-	48ms	ε	Rn201	<1	7.900
					48ms	α	At197		7.540
Fr202	202.003	115	Syn	3+	0.34s	α	At198	~97	7.389
					0.34s	ε	Rn202	~3	9.400
meta state 0.102MeV			Syn	10-	0.34s	α	At198	~97`	7.491
					0.34s	ε	Rn202	~3	9.502
Fr203	203.001	116	Syn	9/2-	0.55s	α	At199	~95	7.280
					0.55s	ε	Rn203	~5	7.200
Fr204	204.001	117	Syn	3+	1.7s	α	At200	~80	7.170
					1.7s	ε	Rn204	~20	8.600
meta state 0.041MeV			Syn	7+	2.6s	α	At200	<=100	7.211
meta state 0.316MeV			Syn	10-	~1s	α	At200	<=100	7.486
					~1s	IT	Fr204		7.486
Fr205	204.999	118	Syn	9/2-	3.85s	ε	Rn205	<1	6.520
					3.85s	α	At204		7.060
Fr206	205.998	119	Syn	5+	15.9s	α	At202		6.926
					15.9s	ε	Rn206		7.750
meta state 0.000MeV			Syn			α	At202	<=84	6.926
meta state 0.650MeV			Syn	10-	0.7s	α	At202		7.576
					0.7s	IT	Fr206		0.650
Fr207	206.997	120	Syn	9/2-	14.8s	α	At203	95	6.900
					14.8s	ε	Rn207	5	5.710
Fr208	207.9971	121	Syn	7+	59.1s	α	At204	90	6.770
					59.1s	ε	Rn208	10	6.990
Fr209	208.9959	122	Syn	9/2-	50s	α	At205	89	6.777
					50s	ε	Rn209	11	5.160
Fr210	209.9964	123	Syn	6+	3.18m	α	At206	60	6.700
					3.18m	ε	Rn210	40	6.262
Fr211	210.9955	124	Syn	9/2-	3.10m	α	At207	>80	6.660
					3.10m	ε	Rn211	<20	4.605
Fr212	211.9962	125	Syn	5+	20m	ε	Rn212	57	5.117
					20m	α	At208	43	6.529
Fr213	212.9962	126	Syn	9/2-	34.6s	α	At209	99.45	6.905
					34.6s	ε	Rn213	0.55	2.148
Fr214	213.999	127	Syn	1-	5ms	α	At210		8.589
meta state 0.122MeV			Syn	8-	3.35ms	α	At210		8.711
Fr215	215.0003	128	Syn	9/2-	86ns	α	At211		9.540
Fr216	216.0032	129	Syn	1-	0.70us	ε	Rn216	<2.0E^-7	2.729
					0.70us	α	At212		9.175
meta state 0.133MeV			Syn	3-	71ns	α	At212	>50	9.308
Fr217	217.0046	130	Syn	9/2-	22us	α	At213		8.469
Fr218	218.0076	131	Syn	1-	1ms	α	At214		8.014
meta state 0.086MeV			Syn		22ms	α	At214	<=100	8.100
					22ms	IT	Fr218		0.086
Fr219	:219.00924	132	Syn	9/2-	20ms	α	At215		7.449
Fr220	220.0123	133	Syn	1+	27.4s	α	At216	99.65	6.801
					27.4s	β^-	Ra220	0.35	1.209
Fr221	221.0143	134	Syn	5/2-	4.9m	β^-	Ra221	<0.1	0.312
					4.9m	α	At217		6.458
Fr222	222.0175	135	Syn	2-	14.2m	β^-	Ra222		2.033
Fr223	223.0197	136	100.	3/2-	21.8m	β^-	Ra223	99.99	1.149
					21.8m	α	At219	0.0060	5.430
Fr224	224.0232	137	Syn	1-	3.33m	β^-	Ra224		2.830
Fr225	225.0256	138	Syn	3/2-	4m	β^-	Ra225		1.866
Fr226	226.0293	139	Syn	1-	49s	β^-	Ra226		3.670
Fr227	227.032	140	Syn	1/2+	2.47m	β^-	Ra227		2.490
Fr228	228.036	141	Syn	2-	38s	β^-	Ra228	<=100	4.340
Fr229	229.038	142	Syn	1/2+	50s	β^-	Ra229
Fr230	230.043	143	Syn		19.1s	β^-	Ra230
Fr231	231.045	144	Syn		17.5s	β^-	Ra231

Nuclide	Potential Parent Nuclides
Fr200	None known
meta state	None known
Fr201	None known
Fr202	None known
meta state 0.102MeV	None known
Fr203	None known
Fr204	Fr204m1 (Syn)
meta state 0.041MeV	None known
meta state 0.316MeV	None known
Fr205	Ac209 (Syn) Ra205 (Syn)
Fr206	Ac210 (Syn) Fr206m1 (Syn)
meta state 0.000MeV	None known
meta state 0.650MeV	None known
Fr207	Ac211 (Syn) Ra207 (Syn) Ra207m (Syn)
Fr208	Ac212 (Syn) Ra208 (Syn)
Fr209	Ac213 (Syn) Ra209 (Syn)
Fr210	Ac214 (Syn) Ra210 (Syn)
Fr211	Ac215 (Syn) Ra211 (Syn)
Fr212	Ac216 (Syn) Ac216m (Syn) Ra212 (Syn)
Fr213	Ac217 (Syn) Ra213 (Syn)
Fr214	Ac218 (Syn) Ra214 (Syn)
meta state 0.122MeV	None known
Fr215	Ac219 (Syn)
Fr216	Ac220 (Syn) Ra216 (Syn)
meta state 0.133MeV	None known
Fr217	Ac221 (Syn)
Fr218	Ac222 (Syn) Ac222m (Syn) Fr218m (Syn)
meta state 0.086MeV	None known
Fr219	Ac223 (Syn)
Fr220	Ac224 (Syn)
Fr221	Ac225 (Syn) Rn221 (Syn)
Fr222	Ac226 (Syn)
Fr223	Ac227 (Natural) Rn223 (Syn)
Fr224	Rn224 (Syn)
Fr225	Rn225 (Syn)
Fr226	Rn226 (Syn)
Fr227	Rn227 (Syn)
Fr228	Rn228 (Syn)
Fr229	None known
Fr230	None known
Fr231	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

A list of reference sources used to compile the data provided on our periodic table of elements can be found on the main periodic table page.

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Fr - Francium

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