87 – Francium, Fr

PERIODIC TABLE

Spectrograph
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Elemental Tile
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Francium from Uraninite
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Francium is the second-least electronegative element, behind only caesium and is a highly radioactive metal that decays into astatine, radium, and radon. As an alkali metal, it has one valence electron. Bulk francium has never been viewed as it is assumed to be a highly reflective metal, if enough could be collected to be viewed as a bulk solid or liquid. With the extreme heat of decay (half-life of its longest-lived isotope is 22 minutes) it would immediately vaporise any viewable quantity of the element.

1939 by Marguerite Perey, France.

DISCOVERY

From the name of France.

ETYMOLOGY

Francium

Element

Fr

Symbol

87 Atomic Number

Alkali Metal

Classification

7440-73-5

CAS Number

Silver

Elemental Colour

-

Refractive Index

-

Poisson Ratio

79.650 cm³

Molar Volume

-

Brinell Hardness

-

Mohs Hardness

-

Vickers Hardness

-

Speed of Sound

-

Bulk Modulus

-

Shear Modulus

-

Young Modulus

Allotropes

NONE

-

Melting Point

-

Boiling Point

-

Automatic Ignition

-

Flashpoint

-

Critical Temperature

-

Critical Pressure

-

Thermal Conductivity

-

Thermal Expansion

-

Specific Heat

2.000 kJ/mol

Heat Fusion

65.000 kJ/mol

Heat Vaporisation

-

Heat Combustion

-

Curie Point

-

Neel Point

-

Adiabatic Index

Solid

Phase

-

Electrical Type

-

Conductivity

-

Resistivity

-

Superconducting Point

-

Magnetic Type

-

Mass Susceptibility

-

Molar Susceptibility

-

Volume Susceptibility

Material Composition

-

Universe

-

Meteorites

-

Sun

-

Earth Crust

-

Oceans

-

Humans

223.019'736'0

Atomic Weight

-

Atomic Radius

223 pm

Covalent Radius Single Bond

218 pm

Covalent Radius Double Bond

-

Covalent Radius Triple Bond

348 pm

Van der Waals Radius

[Rn]7s¹

Electron Configuration

Cubic, Body-centred

Crystal Structure

2.800'00 g/cm³

Density as Solid

3.000'00 g/cm³

Density as Liquid

-

Density as Gas

-

Space Group Name

-

Space Group Number

-

Lattice Angles

-

Lattice Constants

21.67 minutes

Half Life

31.67 minutes

Lifetime

7s¹ = 7, 0, 0, +1/2

Quantum Numbers

-

Neutron Cross Section

-

Neutron Mass Absorption

Stable Isotopes

NONE

Unstable Isotopes

Isotopes Overview

Isotope	Stability	Symbol	Type	Protons	&nbsp	Neutrons	&nbsp	Spin	Parity	Mass	&nbsp	Abundance	&nbsp	Mass Measure	Mass Excess	&nbsp	Binding Energy	&nbsp	Dipole Moment	&nbsp	Quadrupole Moment	&nbsp	Halflife in Years	&nbsp	Halflife in Seconds	&nbsp	A01 Decay Probability	&nbsp	A01 Decay Mode	A01 Decay Energy	&nbsp	A01 Decay Daughter	A01 Decay Link	A02 Decay Mode	A02 Decay Energy	&nbsp	A02 Decay Daughter	A02 Decay Link	A03 Decay Probability	&nbsp	A03 Decay Mode	A03 Decay Energy	&nbsp	A03 Decay Daughter	A03 Decay Link	Y01 Decay Product Yield	&nbsp	Y01 Decay Product Nuclide	Y02 Decay Product Yield	&nbsp	Y02 Decay Product Nuclide	Y03 Decay Product Yield	&nbsp	Y03 Decay Product Nuclide	Y04 Decay Product Yield	&nbsp	Y04 Decay Product Nuclide	Y05 Decay Product Yield	&nbsp	Y05 Decay Product Nuclide	Y06 Decay Product Yield	&nbsp	Y06 Decay Product Nuclide
Isotope_087_fr_199_u	Unstable	¹⁹⁹Fr	Boson	87	p	112	n	1/2	1	199.007'258'147'0	u	~ 0	%	~ 0	35.384'000'000'0	MeV	7.621'7.621'7.621'7.621	MeV	-		-		5.07E-10	year	16.000	milli-seconds ( x⁻³ )	100.000'000	%	α	7,812.300	keV	¹⁹⁵At	¹⁹⁹Fr > [ 100 % , α , 7,812.3 keV ] > ¹⁹⁵At	β+	7,256.800	keV	¹⁹⁹Rn	¹⁹⁹Fr > [ , β+ , 7,256.8 keV ] > ¹⁹⁹Rn								60.005'200	%	¹⁸⁷Os	0.000'001	%	¹⁷⁹Hf	?	%	¹⁹⁵Pt
Isotope_087_fr_200_u	Unstable	²⁰⁰Fr	Fermion	87	p	113	n	3	1	200.006'572'490'0	u	~ 0	%	~ 0	6.760'921'000'0	MeV	7.695'312'000'0	MeV	-		-		7.61E-10	year	24.000	milli-seconds ( x⁻³ )	100.000'000	%	α	7,620.700	keV	¹⁹⁶At	²⁰⁰Fr > [ 100 % , α , 7,620.7 keV ] > ¹⁹⁶At													88.240'003	%	¹⁹²Pt	11.525'210	%	¹⁸⁸Os	?	%	¹⁹⁶Pt	?	%	¹⁹⁹Hg	?	%	¹⁹¹Ir
Isotope_087_fr_201_u	Unstable	²⁰¹Fr	Boson	87	p	114	n	9/2	-1	201.003'860'867'0	u	~ 0	%	~ 0	6.122'235'000'0	MeV	7.700'385'000'0	MeV	-		-		1.93E-9	year	61.000	milli-seconds ( x⁻³ )	100.000'000	%	α	7,515.700	keV	¹⁹⁷At	²⁰¹Fr > [ 100 % , α , 7,515.7 keV ] > ¹⁹⁷At	β+	6,646.000	keV	²⁰¹Rn	²⁰¹Fr > [ , β+ , 6,646.0 keV ] > ²⁰¹Rn								3.360'000	%	¹⁸⁹Os	2.830'928	%	¹⁹⁷Au	0.057'072	%	²⁰¹Hg	?	%	¹⁸⁰Hf	?	%	¹⁷⁶Hf
Isotope_087_fr_202_u	Unstable	²⁰²Fr	Fermion	87	p	115	n	3	1	202.003'372'847'0	u	~ 0	%	~ 0	3.596'375'000'0	MeV	7.714'797'000'0	MeV	-		-		9.19E-9	year	290.000	milli-seconds ( x⁻³ )	97.000'000	%	α	7,388.970	keV	¹⁹⁸At	²⁰²Fr > [ 97 % , α , 7,388.97 keV ] > ¹⁹⁸At	β+	8,394.600	keV	²⁰²Rn	²⁰²Fr > [ , β+ , 8,394.6 keV ] > ²⁰²Rn								92.650'600	%	¹⁹⁴Pt	1.194'990	%	¹⁹⁸Hg	0.337'788	%	²⁰²Hg	0.000'003	%	¹⁹³Ir	0.000'002	%	¹⁸⁵Re	0.000'000	%	¹⁸¹Ta
Isotope_087_fr_203_u	Unstable	²⁰³Fr	Boson	87	p	116	n	9/2	-1	203.000'924'647'0	u	~ 0	%	~ 0	3.141'787'000'0	MeV	7.718'812'000'0	MeV	-		-		1.74E-8	year	550.000	milli-seconds ( x⁻³ )	95.000'000	%	α	7,255.500	keV	¹⁹⁹At	²⁰³Fr > [ 95 % , α , 7,255.5 keV ] > ¹⁹⁹At	β+	5,999.400	keV	²⁰³Rn	²⁰³Fr > [ , β+ , 5,999.4 keV ] > ²⁰³Rn								84.797'500	%	¹⁹⁵Pt	3.580'790	%	¹⁹⁹Hg	1.173'000	%	²⁰³Tl	?	%	¹⁹⁰Os	?	%	¹⁷⁸Hf
Isotope_087_fr_204_u	Unstable	²⁰⁴Fr	Fermion	87	p	117	n	3	1	204.000'653'204'0	u	~ 0	%	~ 0	0.861'303'000'0	MeV	7.731'783'000'0	MeV	-		-		5.39E-8	year	1.700	seconds ( x⁰ )	96.000'000	%	α	7,171.280	keV	²⁰⁰At	²⁰⁴Fr > [ 96 % , α , 7,171.28 keV ] > ²⁰⁰At	β+	7,570.300	keV	²⁰⁴Rn	²⁰⁴Fr > [ , β+ , 7,570.3 keV ] > ²⁰⁴Rn								36.697'920	%	²⁰⁰Hg	0.000'647	%	¹⁹²Pt	0.000'000	%	¹⁸⁸Os	?	%	¹⁸⁷Os	?	%	¹⁹¹Ir
Isotope_087_fr_205_u	Unstable	²⁰⁵Fr	Boson	87	p	118	n	9/2	-1	204.998'593'960'0	u	~ 0	%	~ 0	0.608'456'000'0	MeV	7.734'687'000'0	MeV	-		-		1.22E-7	year	3.850	seconds ( x⁰ )	100.000'000	%	α	7,054.860	keV	²⁰¹At	²⁰⁵Fr > [ 100 % , α , 7,054.86 keV ] > ²⁰¹At	β+	5,382.000	keV	²⁰⁵Rn	²⁰⁵Fr > [ , β+ , 5,382.0 keV ] > ²⁰⁵Rn								71.467'709	%	¹⁹⁷Au	28.839'597	%	²⁰¹Hg	0.693'000	%	²⁰⁵Tl	?	%	¹⁹⁶Pt	?	%	¹⁸⁰Hf	?	%	¹⁷⁶Hf
Isotope_087_fr_206_u	Unstable	²⁰⁶Fr	Fermion	87	p	119	n	?	0	205.998'666'066'0	u	~ 0	%	~ 0	-1.309'717'000'0	MeV	7.745'686'000'0	MeV	-		-		5.07E-7	year	16.000	seconds ( x⁰ )	58.000'000	%	β+	6,850.800	keV	²⁰⁶Rn	²⁰⁶Fr > [ 58 % , β+ , 6,850.8 keV ] > ²⁰⁶Rn	α	6,923.400	keV	²⁰²At	²⁰⁶Fr > [ , α , 6,923.4 keV ] > ²⁰²At								70.434'965	%	²⁰²Hg	20.653'355	%	²⁰⁶Pb	9.616'037	%	¹⁹⁸Hg	0.000'071	%	¹⁹²Ir	0.000'000	%	¹⁸⁹Os
Isotope_087_fr_207_u	Unstable	²⁰⁷Fr	Boson	87	p	120	n	9/2	-1	206.996'949'414'0	u	~ 0	%	~ 0	-1.242'551'000'0	MeV	7.746'940'000'0	MeV	3.890'000'000'0	nm	-		4.69E-7	year	14.800	seconds ( x⁰ )	95.000'000	%	α	6,897.000	keV	²⁰³At	²⁰⁷Fr > [ 95 % , α , 6,897.0 keV ] > ²⁰³At	β+	4,767.200	keV	²⁰⁷Rn	²⁰⁷Fr > [ , β+ , 4,767.2 keV ] > ²⁰⁷Rn								66.940'458	%	²⁰³Tl	29.523'267	%	¹⁹⁹Hg	3.610'300	%	²⁰⁷Pb
Isotope_087_fr_208_u	Unstable	²⁰⁸Fr	Fermion	87	p	121	n	7	1	207.997'138'783'0	u	~ 0	%	~ 0	-2.841'602'000'0	MeV	7.756'232'000'0	MeV	4.750'000'000'0	nm	-0.160'000'000'0	b	1.87E-6	year	59.100	seconds ( x⁰ )	90.000'000	%	α	6,785.200	keV	²⁰⁴At	²⁰⁸Fr > [ 90 % , α , 6,785.2 keV ] > ²⁰⁴At	β+	5,960.600	keV	²⁰⁸Rn	²⁰⁸Fr > [ , β+ , 5,960.6 keV ] > ²⁰⁸Rn								4.032'348	%	²⁰⁰Hg	0.000'084	%	²⁰⁸Pb
Isotope_087_fr_209_u	Unstable	²⁰⁹Fr	Boson	87	p	122	n	9/2	-1	208.995'953'555'0	u	~ 0	%	~ 0	-2.665'206'000'0	MeV	7.756'899'000'0	MeV	3.950'3.950'3.950'3.950	nm	0.004'000'000'0	b	1.58E-6	year	49.980	seconds ( x⁰ )	89.000'000	%	α	6,777.380	keV	²⁰⁵At	²⁰⁹Fr > [ 89 % , α , 6,777.38 keV ] > ²⁰⁵At	β+	4,137.200	keV	²⁰⁹Rn	²⁰⁹Fr > [ , β+ , 4,137.2 keV ] > ²⁰⁹Rn								91.142'027	%	²⁰⁵Tl	8.932'788	%	²⁰¹Hg	0.000'009	%	¹⁹⁷Au
Isotope_087_fr_210_u	Unstable	²¹⁰Fr	Fermion	87	p	123	n	6	1	209.996'407'738'0	u	~ 0	%	~ 0	-3.769'239'000'0	MeV	7.763'686'000'0	MeV	4.400'000'000'0	nm	0.240'000'000'0	b	6.05E-6	year	190.980	seconds ( x⁰ )	60.000'000	%	α	6,648.500	keV	²⁰⁶At	²¹⁰Fr > [ 60 % , α , 6,648.5 keV ] > ²⁰⁶At	β+	5,229.500	keV	²¹⁰Rn	²¹⁰Fr > [ , β+ , 5,229.5 keV ] > ²¹⁰Rn								92.532'303	%	²⁰⁶Pb	5.867'697	%	²⁰²Hg	0.058'677	%	¹⁹⁸Hg
Isotope_087_fr_211_u	Unstable	²¹¹Fr	Boson	87	p	124	n	9/2	-1	210.995'536'544'0	u	~ 0	%	~ 0	-3.346'170'000'0	MeV	7.763'136'000'0	MeV	4.000'000'000'0	nm	0.190'000'000'0	b	6.02E-6	year	190.020	seconds ( x⁰ )	80.000'000	%	α	6,659.980	keV	²⁰⁸At	²¹¹Fr > [ 80 % , α , 6,659.98 keV ] > ²⁰⁸At	β+	3,575.700	keV	²¹¹Rn	²¹¹Fr > [ , β+ , 3,575.7 keV ] > ²¹¹Rn								93.120'000	%	²⁰⁷Pb	6.896'506	%	²⁰³Tl	0.000'001	%	¹⁹⁹Hg
Isotope_087_fr_212_u	Unstable	²¹²Fr	Fermion	87	p	125	n	5	1	211.996'202'244'0	u	~ 0	%	~ 0	-4.157'682'000'0	MeV	7.768'443'000'0	MeV	4.620'000'000'0	nm	-0.190'000'000'0	b	3.80E-5	year	1.200	kilo-seconds ( x³ )	57.000'000	%	β+	4,099.800	keV	²¹²Rn	²¹²Fr > [ 57 % , β+ , 4,099.8 keV ] > ²¹²Rn	α	6,528.850	keV	²⁰⁸At	²¹²Fr > [ , α , 6,528.85 keV ] > ²⁰⁸At								0.002'225	%	²⁰⁸Pb	?	%	²⁰⁰Hg
Isotope_087_fr_213_u	Unstable	²¹³Fr	Boson	87	p	126	n	9/2	-1	212.996'189'081'0	u	~ 0	%	~ 0	-3.537'587'000'0	MeV	7.766'946'000'0	MeV	4.020'000'000'0	nm	-0.100'000'000'0	b	1.10E-6	year	34.600	seconds ( x⁰ )	99.450'000	%	α	6,904.870	keV	²⁰⁹At	²¹³Fr > [ 99.45 % , α , 6,904.87 keV ] > ²⁰⁹At	β+	1,126.210	keV	²¹³Rn	²¹³Fr > [ , β+ , 1,126.21 keV ] > ²¹³Rn								100.460'428	%	²⁰⁵Tl
Isotope_087_fr_214_u	Unstable	²¹⁴Fr	Fermion	87	p	127	n	1	-1	213.998'971'145'0	u	~ 0	%	~ 0	-3.549'848'000'0	MeV	7.768'433'000'0	MeV	-		-0.140'000'000'0	b	1.58E-10	year	5.000	milli-seconds ( x⁻³ )	100.000'000	%	α	8,588.540	keV	²¹⁰At	²¹⁴Fr > [ 100 % , α , 8,588.54 keV ] > ²¹⁰At													100.175'000	%	²⁰⁶Pb
Isotope_087_fr_215_u	Unstable	²¹⁵Fr	Boson	87	p	128	n	9/2	-1	215.000'341'497'0	u	~ 0	%	~ 0	-0.958'372'000'0	MeV	7.757'739'000'0	MeV	-		-		2.73E-15	year	86.000	nano-seconds ( x⁻⁹ )	100.000'000	%	α	9,540.340	keV	²¹¹At	²¹⁵Fr > [ 100 % , α , 9,540.34 keV ] > ²¹¹At													100.000'000	%	²⁰⁷Pb
Isotope_087_fr_216_u	Unstable	²¹⁶Fr	Fermion	87	p	129	n	1	-1	216.003'197'990'0	u	~ 0	%	~ 0	0.318'103'000'0	MeV	7.753'260'000'0	MeV	-		-		2.22E-13	year	7.000	micro-seconds ( x⁻⁶ )	100.000'000	%	α	9,175.200	keV	²¹²At	²¹⁶Fr > [ 100 % , α , 9,175.2 keV ] > ²¹²At	β+	1,701.100	keV	²¹⁶Rn	²¹⁶Fr > [ , β+ , 1,701.1 keV ] > ²¹⁶Rn								100.030'000	%	²⁰⁸Pb	?	%	²⁰⁰Hg
Isotope_087_fr_217_u	Unstable	²¹⁷Fr	Boson	87	p	130	n	9/2	-1	217.004'631'951'0	u	~ 0	%	~ 0	2.978'909'000'0	MeV	7.742'414'000'0	MeV	-		-		5.32E-13	year	16.800	micro-seconds ( x⁻⁶ )	100.000'000	%	α	8,469.190	keV	²¹³At	²¹⁷Fr > [ 100 % , α , 8,469.19 keV ] > ²¹³At													100.000'000	%	²⁰⁵Tl
Isotope_087_fr_218_u	Unstable	²¹⁸Fr	Fermion	87	p	131	n	1	-1	218.007'578'322'0	u	~ 0	%	~ 0	4.314'635'000'0	MeV	7.737'774'000'0	MeV	-		-		3.17E-11	year	1.000	milli-seconds ( x⁻³ )	100.000'000	%	α	8,013.950	keV	²¹⁴At	²¹⁸Fr > [ 100 % , α , 8,013.95 keV ] > ²¹⁴At													100.000'132	%	²⁰⁶Pb
Isotope_087_fr_219_u	Unstable	²¹⁹Fr	Boson	87	p	132	n	9/2	-1	219.009'252'149'0	u	~ 0	%	~ 0	7.059'162'000'0	MeV	7.726'715'000'0	MeV	-		-		6.34E-10	year	20.000	milli-seconds ( x⁻³ )	100.000'000	%	α	7,448.530	keV	²¹⁵At	²¹⁹Fr > [ 100 % , α , 7,448.53 keV ] > ²¹⁵At													100.276'000	%	²⁰⁷Pb
Isotope_087_fr_220_u	Unstable	²²⁰Fr	Fermion	87	p	133	n	1	1	220.012'327'405'0	u	~ 0	%	~ 0	8.618'322'000'0	MeV	7.721'169'000'0	MeV	-0.670'000'000'0	nm	-		8.68E-7	year	27.400	seconds ( x⁰ )	100.000'000	%	α	6,800.740	keV	²¹⁶At	²²⁰Fr > [ 100 % , α , 6,800.74 keV ] > ²¹⁶At	β-	1,210.030	keV	²²⁰Ra	²²⁰Fr > [ , β- , 1,210.03 keV ] > ²²⁰Ra								100.360'000	%	²⁰⁸Pb
Isotope_087_fr_221_u	Unstable	²²¹Fr	Boson	87	p	134	n	5/2	-1	221.014'254'762'0	u	~ 0	%	~ 0	11.482'904'000'0	MeV	7.709'740'000'0	MeV	1.580'000'000'0	nm	0.470'000'000'0	b	1.53E-7	year	4.833	seconds ( x⁰ )	100.000'000	%	α	6,457.760	keV	²¹⁷At	²²¹Fr > [ 100 % , α , 6,457.76 keV ] > ²¹⁷At	β-	314.310	keV	²²¹Ra	²²¹Fr > [ , β- , 314.31 keV ] > ²²¹Ra	0.000'000	%	14C	?	keV	²⁰⁷Tl	²²¹Fr > [ 0.000000000088 % , 14C , ? keV ] > ²⁰⁷Tl	100.012'800	%	²⁰⁵Tl	0.000'000	%	²⁰⁷Pb
Isotope_087_fr_222_u	Unstable	²²²Fr	Fermion	87	p	135	n	2	-1	222.017'551'730'0	u	~ 0	%	~ 0	13.278'226'000'0	MeV	7.703'252'000'0	MeV	0.630'000'000'0	nm	-1.000'000'000'0	b	2.70E-5	year	852.000	seconds ( x⁰ )	100.000'000	%	β-	2,028.000	keV	²²²Ra	²²²Fr > [ 100 % , β- , 2,028.0 keV ] > ²²²Ra													100.000'134	%	²⁰⁶Pb	0.000'000	%	²⁰⁸Pb
Isotope_087_fr_223_u	Unstable	²²³Fr	Boson	87	p	136	n	3/2	-1	223.019'735'857'0	u	~ 0	%	~ 0	16.349'332'000'0	MeV	7.691'076'000'0	MeV	1.170'000'000'0	nm	0.051'000'000'0	b	4.13E-5	year	1.302	kilo-seconds ( x³ )	100.000'000	%	β-	1,149.170	keV	²²³Ra	²²³Fr > [ 100 % , β- , 1,149.17 keV ] > ²²³Ra	α	5,561.870	keV	²¹⁹At	²²³Fr > [ , α , 5,561.87 keV ] > ²¹⁹At								100.282'247	%	²⁰⁷Pb	0.000'000	%	²⁰⁵Tl
Isotope_087_fr_224_u	Unstable	²²⁴Fr	Fermion	87	p	137	n	1	-1	224.023'249'951'0	u	~ 0	%	~ 0	18.383'833'000'0	MeV	7.683'658'000'0	MeV	0.400'000'000'0	nm	1.170'000'000'0	b	6.33E-6	year	199.800	seconds ( x⁰ )	100.000'000	%	β-	2,830.000	keV	²²⁴Ra	²²⁴Fr > [ 100 % , β- , 2,830.0 keV ] > ²²⁴Ra													100.004'000	%	²⁰⁸Pb	0.000'000	%	²⁰⁶Pb
Isotope_087_fr_225_u	Unstable	²²⁵Fr	Boson	87	p	138	n	3/2	-1	224.023'249'951'0	u	~ 0	%	~ 0	21.657'190'000'0	MeV	7.670'775'000'0	MeV	1.070'000'000'0	nm	0.517'000'000'0	b	7.61E-6	year	240.000	seconds ( x⁰ )	100.000'000	%	β-	1,820.000	keV	²²⁵Ra	²²⁵Fr > [ 100 % , β- , 1,820.0 keV ] > ²²⁵Ra													100.012'800	%	²⁰⁵Tl	0.000'000	%	²⁰⁷Pb
Isotope_087_fr_226_u	Unstable	²²⁶Fr	Fermion	87	p	139	n	1	-1	226.029'386'231'0	u	~ 0	%	~ 0	23.814'031'000'0	MeV	7.662'970'000'0	MeV	0.071'200'000'0	nm	1.320'000'000'0	b	1.55E-6	year	49.020	seconds ( x⁰ )	100.000'000	%	β-	3,704.000	keV	²²⁶Ra	²²⁶Fr > [ 100 % , β- , 3,704.0 keV ] > ²²⁶Ra													100.044'159	%	²⁰⁶Pb	0.000'002	%	²⁰⁵Tl	0.000'000	%	²⁰⁸Pb
Isotope_087_fr_227_u	Unstable	²²⁷Fr	Boson	87	p	140	n	1/2	1	227.031'835'938'0	u	~ 0	%	~ 0	27.373'099'000'0	MeV	7.649'028'000'0	MeV	1.500'000'000'0	nm	-1.350'000'000'0	b	4.69E-6	year	148.020	seconds ( x⁰ )	100.000'000	%	β-	2,476.000	keV	²²⁷Ra	²²⁷Fr > [ 100 % , β- , 2,476.0 keV ] > ²²⁷Ra													100.276'314	%	²⁰⁷Pb	0.000'000	%	²⁰⁵Tl
Isotope_087_fr_228_u	Unstable	²²⁸Fr	Fermion	87	p	141	n	2	-1	228.035'729'000'0	u	~ 0	%	~ 0	29.654'986'000'0	MeV	7.640'836'000'0	MeV	-0.760'000'000'0	nm	-		1.20E-6	year	37.980	seconds ( x⁰ )	100.000'000	%	β-	4,340.000	keV	²²⁸Ra	²²⁸Fr > [ 100 % , β- , 4,340.0 keV ] > ²²⁸Ra													100.004'000	%	²⁰⁸Pb	0.000'000	%	²⁰⁶Pb
Isotope_087_fr_229_u	Unstable	²²⁹Fr	Boson	87	p	142	n	1/2	1	229.038'450'228'0	u	~ 0	%	~ 0	33.282'000'000'0	MeV	7.627'000'000'0	MeV	-		2.380'000'000'0	b	1.59E-6	year	50.200	seconds ( x⁰ )	100.000'000	%	β-	3,253.400	keV	²²⁹Ra	²²⁹Fr > [ 100 % , β- , 3,253.4 keV ] > ²²⁹Ra													100.012'800	%	²⁰⁵Tl	0.000'000	%	²⁰⁷Pb
Isotope_087_fr_230_u	Unstable	²³⁰Fr	Fermion	87	p	143	n	?	0	230.042'510'000'0	u	~ 0	%	~ 0	35.816'157'000'0	MeV	7.617'691'000'0	MeV	-		-		6.05E-7	year	19.100	seconds ( x⁰ )	100.000'000	%	β-	5,080.000	keV	²³⁰Ra	²³⁰Fr > [ 100 % , β- , 5,080.0 keV ] > ²³⁰Ra													100.044'159	%	²⁰⁶Pb	0.000'002	%	²⁰⁵Tl	0.000'000	%	²⁰⁸Pb
Isotope_087_fr_231_u	Unstable	²³¹Fr	Boson	87	p	144	n	1/2	1	231.045'440'000'0	u	~ 0	%	~ 0	39.598'000'000'0	MeV	7.603'000'000'0	MeV	-		-		5.58E-7	year	17.600	seconds ( x⁰ )	100.000'000	%	β-	3,931.000	keV	²³¹Ra	²³¹Fr > [ 100 % , β- , 3,931.0 keV ] > ²³¹Ra													100.276'314	%	²⁰⁷Pb	0.000'000	%	²⁰⁵Tl	0.000'000	%	²⁰⁸Pb
Isotope_087_fr_232_u	Unstable	²³²Fr	Fermion	87	p	145	n	?	0	232.049'772'000'0	u	~ 0	%	~ 0	42.328'000'000'0	MeV	7.593'000'000'0	MeV	-		-		1.58E-7	year	5.000	seconds ( x⁰ )	100.000'000	%	β-	5,714.000	keV	²³²Ra	²³²Fr > [ 100 % , β- , 5,714.0 keV ] > ²³²Ra													100.004'000	%	²⁰⁸Pb	0.000'000	%	²⁰⁶Pb	?	%	²⁰⁰Hg

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