Rûbîdyûm (Rb)

chemical element with symbol Rb and atomic number 37

Atomic Number	37
Atomic Weight	85.4678
Hejmara baristeyî	85

Group	1
Period	5
Block	s

Proton	37 p⁺
Notron	48 n⁰
Kareva	37 e^-

Physical Property

Atomic Radius	235 pm 240 pm
molar volume	55,9 cm³/mol
Covalent Radius	210 pm 202 pm 225 pm 220 pm
Metallic Radius	216 pm 248 pm
ionic radius	152 pm 156 pm 161 pm 163 pm 166 pm 169 pm 172 pm 183 pm
Crystal Radius	166 pm 170 pm 175 pm 177 pm 180 pm 183 pm 186 pm 197 pm
Van der Waals radius	290 pm 303 pm 325 pm 303 pm 411,4 pm
density	1,53 g/cm³ 1.460 kg/m³

Chemical Property

wize

proton affinity
electron affinity	0,48592 eV/particle
ionization energy	4,177128 eV/particle 27,28954 eV/particle 39,247 eV/particle 52,2 eV/particle 68,4 eV/particle 82,9 eV/particle 98,67 eV/particle 132,8 eV/particle 150,63 eV/particle 277,12 eV/particle 313,1 eV/particle 356 eV/particle 400 eV/particle 443 eV/particle 502 eV/particle 550 eV/particle 601 eV/particle 654 eV/particle 706 eV/particle 857 eV/particle 905,3 eV/particle 958,9 eV/particle 1.024 eV/particle 1.080 eV/particle 1.125 eV/particle 1.242,5 eV/particle 1.294,567 eV/particle 3.133,3 eV/particle 3.281 eV/particle 3.442 eV/particle 3.600 eV/particle 3.815 eV/particle 3.988 eV/particle 4.214 eV/particle 4.356,865 eV/particle 18.305,883 eV/particle 18.965,51 eV/particle

enthalpy of vaporization	75,8 kJ/mol
enthalpy of fusion	2,2 kJ/mol
standard enthalpy of formation	80,9 kJ/mol
Kareva

electron shell	2, 8, 18, 8, 1

valence electron	1 ⓘ

electron configuration	[Kr] 5s¹ⓘ 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁶ 5s¹

oxidation number	-1, 1
electronegativity	4,177 eV/particle 0.104686 0.82
Electrophilicity Index	0,7363448717297969 eV/particle
fundamental state of matter

phase of matter	Solid
gaseous state of matter
Boiling Point	961,15 K
Melting Point	312,45 K
critical pressure	16 MPa
critical temperature	2.093,15 K
triple point	312,41 K
appearance
color	Silver #ff1493 #702eb0 #702eb0
appearance	grey white
refractive index
thermodynamic material property
Thermal Conductivity	58,2 W/(m K)
thermal expansion
molar heat capacity	31,06 J/(mol K)
Specific Heat Capacity	0,363 J/(g⋅K)
heat capacity ratio
electrical properties
type	Conductor
electrical conductivity	8,3 MS/m
electrical resistivity	0,00000012 Ω*m
superconductivity
magnetism
type	paramagnetic
magnetic susceptibility (Mass)	0,0000000026 m³/Kg
magnetic susceptibility (Molar)	0,000000000222 m³/mol
magnetic susceptibility (Volume)	0,00000398
magnetic ordering
Germahiya Curie
Néel temperature
pêkhate
Crystal Structure	Body Centered Cubic (BCC)
lattice constant	5,59 Å
Lattice Angles	π/2, π/2, π/2
mechanical property
hardness	0,216 MPa 0,3 MPa
bulk modulus	2,5 GPa
shear modulus
Young's modulus	2,4 GPa
Poisson's ratio
Leza dengê	1.300 m/s
classification
Category	Alkali metals, Alkali metals
CAS Group	IA
IUPAC Group	IA
Glawe Number	9
Mendeleev Number	4
Pettifor Number	9
Geochemical Class	alkali metal
Goldschmidt classification	litophile

other

Gas Basicity
polarizability	319,8 ± 0,3 a₀
C6 Dispersion Coefficient	4.769 a₀ 4.660 a₀
allotrope
Neutron cross section	0,38
Neutron Mass Absorption	0,0003
quantum number	2S1/2
space group	229 (Im_3m)

Isotopes of Rubidium

Stable Isotopes	1
Unstable Isotopes	33
Natural Isotopes	2

⁷¹Rb

Hejmara baristeyî	71
neutron number	34
Giraniya Atomê	70,965335 ± 0,000429 Da
g-factor
natural abundance
radioactivity	☢️ radioactive element
half-life
spin	5/2
nuclear quadrupole moment
dema îcadkirinê yan keşfê
parity	-

decay mode	intensity
p (proton emission)

⁷²Rb

Hejmara baristeyî	72
neutron number	35
Giraniya Atomê	71,958851 ± 0,000537 Da
g-factor
natural abundance
radioactivity	☢️ radioactive element
half-life	103 ± 22 ns
spin	1
nuclear quadrupole moment
dema îcadkirinê yan keşfê	2017
parity	+

decay mode	intensity
p (proton emission)

⁷³Rb

Hejmara baristeyî	73
neutron number	36
Giraniya Atomê	72,950604506 ± 0,000043794 Da
g-factor
natural abundance
radioactivity	☢️ radioactive element
half-life
spin	3/2
nuclear quadrupole moment
dema îcadkirinê yan keşfê	1996
parity	-

decay mode	intensity
β⁺ (β⁺ decay; β⁺ = ϵ + e⁺)
p (proton emission)	100%

⁷⁴Rb

Hejmara baristeyî	74
neutron number	37
Giraniya Atomê	73,944265867 ± 0,000003249 Da
g-factor	0
natural abundance
radioactivity	☢️ radioactive element
half-life	64,78 ± 0,03 ms
spin	0
nuclear quadrupole moment	0
dema îcadkirinê yan keşfê	1977
parity	+

decay mode	intensity
β⁺ (β⁺ decay; β⁺ = ϵ + e⁺)	100%
β⁺ p (β⁺-delayed proton emission)

⁷⁵Rb

Hejmara baristeyî	75
neutron number	38
Giraniya Atomê	74,9385732 ± 0,000001266 Da
g-factor	0,386 ± 0,00066666666666667
natural abundance
radioactivity	☢️ radioactive element
half-life	19 ± 1,2 s
spin	3/2
nuclear quadrupole moment	0,81 ± 0,04
dema îcadkirinê yan keşfê	1975
parity	-

decay mode	intensity
β⁺ (β⁺ decay; β⁺ = ϵ + e⁺)	100%

⁷⁶Rb

Hejmara baristeyî	76
neutron number	39
Giraniya Atomê	75,935073031 ± 0,000001006 Da
g-factor	-0,372552 ± 0,000011
natural abundance
radioactivity	☢️ radioactive element
half-life	36,5 ± 0,6 s
spin	1
nuclear quadrupole moment	0,41 ± 0,09
dema îcadkirinê yan keşfê	1969
parity	-

decay mode	intensity
β⁺ (β⁺ decay; β⁺ = ϵ + e⁺)	100%
β⁺α (β⁺-delayed α emission)	3.8%

⁷⁷Rb

Hejmara baristeyî	77
neutron number	40
Giraniya Atomê	76,930401599 ± 0,0000014 Da
g-factor	0,43622666666667 ± 0,000013333333333333
natural abundance
radioactivity	☢️ radioactive element
half-life	3,78 ± 0,04 m
spin	3/2
nuclear quadrupole moment	0,84 ± 0,17
dema îcadkirinê yan keşfê	1972
parity	-

decay mode	intensity
β⁺ (β⁺ decay; β⁺ = ϵ + e⁺)	100%

⁷⁸Rb

Hejmara baristeyî	78
neutron number	41
Giraniya Atomê	77,928141866 ± 0,000003475 Da
g-factor	0
natural abundance
radioactivity	☢️ radioactive element
half-life	17,66 ± 0,03 m
spin	0
nuclear quadrupole moment	0
dema îcadkirinê yan keşfê	1968
parity	+

decay mode	intensity
β⁺ (β⁺ decay; β⁺ = ϵ + e⁺)	100%

⁷⁹Rb

Hejmara baristeyî	79
neutron number	42
Giraniya Atomê	78,923990095 ± 0,000002085 Da
g-factor	1,34292 ± 0,00048
natural abundance
radioactivity	☢️ radioactive element
half-life	22,9 ± 0,5 m
spin	5/2
nuclear quadrupole moment	-0,12 ± 0,04
dema îcadkirinê yan keşfê	1957
parity	+

decay mode	intensity
β⁺ (β⁺ decay; β⁺ = ϵ + e⁺)	100%

⁸⁰Rb

Hejmara baristeyî	80
neutron number	43
Giraniya Atomê	79,922516442 ± 0,000002 Da
g-factor	-0,0833 ± 0,0007
natural abundance
radioactivity	☢️ radioactive element
half-life	33,4 ± 0,7 s
spin	1
nuclear quadrupole moment	0,42 ± 0,08
dema îcadkirinê yan keşfê	1961
parity	+

decay mode	intensity
β⁺ (β⁺ decay; β⁺ = ϵ + e⁺)	100%

⁸¹Rb

Hejmara baristeyî	81
neutron number	44
Giraniya Atomê	80,9189939 ± 0,000005265 Da
g-factor	1,3727333333333 ± 0,00093333333333333
natural abundance
radioactivity	☢️ radioactive element
half-life	4,572 ± 0,004 h
spin	3/2
nuclear quadrupole moment	0,48 ± 0,1
dema îcadkirinê yan keşfê	1949
parity	-

decay mode	intensity
β⁺ (β⁺ decay; β⁺ = ϵ + e⁺)	100%

⁸²Rb

Hejmara baristeyî	82
neutron number	45
Giraniya Atomê	81,918209023 ± 0,00000323 Da
g-factor	0,554403 ± 0,000016
natural abundance
radioactivity	☢️ radioactive element
half-life	1,2575 ± 0,0002 m
spin	1
nuclear quadrupole moment	0,23 ± 0,1
dema îcadkirinê yan keşfê	1949
parity	+

decay mode	intensity
β⁺ (β⁺ decay; β⁺ = ϵ + e⁺)	100%

⁸³Rb

Hejmara baristeyî	83
neutron number	46
Giraniya Atomê	82,915114181 ± 0,0000025 Da
g-factor	0,56984 ± 0,00032
natural abundance
radioactivity	☢️ radioactive element
half-life	86,2 ± 0,1 d
spin	5/2
nuclear quadrupole moment	0,24 ± 0,05
dema îcadkirinê yan keşfê	1950
parity	-

decay mode	intensity
ϵ (electron capture)	100%

⁸⁴Rb

Hejmara baristeyî	84
neutron number	47
Giraniya Atomê	83,914375223 ± 0,000002355 Da
g-factor	-0,6625 ± 0,001
natural abundance
radioactivity	☢️ radioactive element
half-life	32,82 ± 0,07 d
spin	2
nuclear quadrupole moment	-0,02 ± 0,04
dema îcadkirinê yan keşfê	1947
parity	-

decay mode	intensity
β⁺ (β⁺ decay; β⁺ = ϵ + e⁺)	96.1%
β⁻ (β⁻ decay)	3.9%

⁸⁵Rb

Hejmara baristeyî	85
neutron number	48
Giraniya Atomê	84,91178973604 ± 0,00000000537 Da
g-factor	0,541224 ± 0,000016
natural abundance	72,17 ± 0,02
radioactivity	stable isotope
half-life	Not Radioactive ☢️
spin	5/2
nuclear quadrupole moment	0,276 ± 0,001
dema îcadkirinê yan keşfê	1921
parity	-

⁸⁶Rb

Hejmara baristeyî	86
neutron number	49
Giraniya Atomê	85,911167443 ± 0,000000214 Da
g-factor	-0,8487 ± 0,0008
natural abundance
radioactivity	☢️ radioactive element
half-life	18,645 ± 0,008 d
spin	2
nuclear quadrupole moment	0,23 ± 0,06
dema îcadkirinê yan keşfê	1941
parity	-

decay mode	intensity
β⁻ (β⁻ decay)	100%
ϵ (electron capture)	0.0052%

⁸⁷Rb

Hejmara baristeyî	87
neutron number	50
Giraniya Atomê	86,909180529 ± 0,000000006 Da
g-factor	1,8341933333333 ± 0,000053333333333333
natural abundance	27,83 ± 0,02
radioactivity	☢️ radioactive element
half-life	49,7 ± 0,3 Gy
spin	3/2
nuclear quadrupole moment	0,1335 ± 0,0005
dema îcadkirinê yan keşfê	1921
parity	-

decay mode	intensity
β⁻ (β⁻ decay)	100%

⁸⁸Rb

Hejmara baristeyî	88
neutron number	51
Giraniya Atomê	87,91131559 ± 0,00000017 Da
g-factor	0,253755 ± 0,00001
natural abundance
radioactivity	☢️ radioactive element
half-life	17,78 ± 0,03 m
spin	2
nuclear quadrupole moment	-0,01 ± 0,11
dema îcadkirinê yan keşfê	1939
parity	-

decay mode	intensity
β⁻ (β⁻ decay)	100%

⁸⁹Rb

Hejmara baristeyî	89
neutron number	52
Giraniya Atomê	88,912278136 ± 0,000005825 Da
g-factor	1,5887333333333 ± 0,00046666666666667
natural abundance
radioactivity	☢️ radioactive element
half-life	15,32 ± 0,1 m
spin	3/2
nuclear quadrupole moment	0,17 ± 0,03
dema îcadkirinê yan keşfê	1940
parity	-

decay mode	intensity
β⁻ (β⁻ decay)	100%

⁹⁰Rb

Hejmara baristeyî	90
neutron number	53
Giraniya Atomê	89,914797557 ± 0,000006926 Da
g-factor	0
natural abundance
radioactivity	☢️ radioactive element
half-life	158 ± 5 s
spin	0
nuclear quadrupole moment	0
dema îcadkirinê yan keşfê	1951
parity	-

decay mode	intensity
β⁻ (β⁻ decay)	100%

⁹¹Rb

Hejmara baristeyî	91
neutron number	54
Giraniya Atomê	90,916537261 ± 0,000008375 Da
g-factor	1,4540666666667 ± 0,001
natural abundance
radioactivity	☢️ radioactive element
half-life	58,2 ± 0,3 s
spin	3/2
nuclear quadrupole moment	0,19 ± 0,05
dema îcadkirinê yan keşfê	1951
parity	-

decay mode	intensity
β⁻ (β⁻ decay)	100%
β⁻ n (β⁻-delayed neutron emission)

⁹²Rb

Hejmara baristeyî	92
neutron number	55
Giraniya Atomê	91,919728477 ± 0,000006573 Da
g-factor	0
natural abundance
radioactivity	☢️ radioactive element
half-life	4,48 ± 0,03 s
spin	0
nuclear quadrupole moment	0
dema îcadkirinê yan keşfê	1960
parity	-

decay mode	intensity
β⁻ (β⁻ decay)	100%
β⁻ n (β⁻-delayed neutron emission)	0.0107%

⁹³Rb

Hejmara baristeyî	93
neutron number	56
Giraniya Atomê	92,922039334 ± 0,000008406 Da
g-factor	0,56368 ± 0,00064
natural abundance
radioactivity	☢️ radioactive element
half-life	5,84 ± 0,02 s
spin	5/2
nuclear quadrupole moment	0,21 ± 0,06
dema îcadkirinê yan keşfê	1960
parity	-

decay mode	intensity
β⁻ (β⁻ decay)	100%
β⁻ n (β⁻-delayed neutron emission)	1.39%

⁹⁴Rb

Hejmara baristeyî	94
neutron number	57
Giraniya Atomê	93,926394819 ± 0,000002177 Da
g-factor	0,49936666666667 ± 0,0006
natural abundance
radioactivity	☢️ radioactive element
half-life	2,702 ± 0,005 s
spin	3
nuclear quadrupole moment	0,2 ± 0,07
dema îcadkirinê yan keşfê	1961
parity	-

decay mode	intensity
β⁻ (β⁻ decay)	100%
β⁻ n (β⁻-delayed neutron emission)	10.3%

⁹⁵Rb

Hejmara baristeyî	95
neutron number	58
Giraniya Atomê	94,929263849 ± 0,000021733 Da
g-factor	0,5332 ± 0,0012
natural abundance
radioactivity	☢️ radioactive element
half-life	377,7 ± 0,8 ms
spin	5/2
nuclear quadrupole moment	0,26 ± 0,09
dema îcadkirinê yan keşfê	1967
parity	-

decay mode	intensity
β⁻ (β⁻ decay)	100%
β⁻ n (β⁻-delayed neutron emission)	8.7%

⁹⁶Rb

Hejmara baristeyî	96
neutron number	59
Giraniya Atomê	95,934133398 ± 0,000003599 Da
g-factor	0,73275 ± 0,00085
natural abundance
radioactivity	☢️ radioactive element
half-life	201,5 ± 0,9 ms
spin	2
nuclear quadrupole moment	0,3 ± 0,09
dema îcadkirinê yan keşfê	1967
parity	-

decay mode	intensity
β⁻ (β⁻ decay)	100%
β⁻ n (β⁻-delayed neutron emission)	13.7%
2n (2-neutron emission)

⁹⁷Rb

Hejmara baristeyî	97
neutron number	60
Giraniya Atomê	96,937177117 ± 0,000002052 Da
g-factor	1,2266666666667 ± 0,0013333333333333
natural abundance
radioactivity	☢️ radioactive element
half-life	169,1 ± 0,6 ms
spin	3/2
nuclear quadrupole moment	0,7
dema îcadkirinê yan keşfê	1969
parity	+

decay mode	intensity
β⁻ (β⁻ decay)	100%
β⁻ n (β⁻-delayed neutron emission)	25.5%
2n (2-neutron emission)

⁹⁸Rb

Hejmara baristeyî	98
neutron number	61
Giraniya Atomê	97,941632317 ± 0,000017265 Da
g-factor	0
natural abundance
radioactivity	☢️ radioactive element
half-life	115 ± 6 ms
spin	0
nuclear quadrupole moment	0
dema îcadkirinê yan keşfê	1971
parity	-

decay mode	intensity
β⁻ (β⁻ decay)	100%
β⁻ n (β⁻-delayed neutron emission)	14.3%
2n (2-neutron emission)	0.054%

⁹⁹Rb

Hejmara baristeyî	99
neutron number	62
Giraniya Atomê	98,94511919 ± 0,000004327 Da
g-factor
natural abundance
radioactivity	☢️ radioactive element
half-life	54 ± 4 ms
spin	3/2
nuclear quadrupole moment
dema îcadkirinê yan keşfê	1971
parity	+

decay mode	intensity
β⁻ (β⁻ decay)	100%
β⁻ n (β⁻-delayed neutron emission)	17.3%
2n (2-neutron emission)

¹⁰⁰Rb

Hejmara baristeyî	100
neutron number	63
Giraniya Atomê	99,950331532 ± 0,000014089 Da
g-factor
natural abundance
radioactivity	☢️ radioactive element
half-life	51,3 ± 1,6 ms
spin	4
nuclear quadrupole moment
dema îcadkirinê yan keşfê	1978
parity	-

decay mode	intensity
β⁻ (β⁻ decay)	100%
β⁻ n (β⁻-delayed neutron emission)	5.6%
2n (2-neutron emission)	0.15%

¹⁰¹Rb

Hejmara baristeyî	101
neutron number	64
Giraniya Atomê	100,954302 ± 0,000022 Da
g-factor
natural abundance
radioactivity	☢️ radioactive element
half-life	31,8 ± 3,3 ms
spin	3/2
nuclear quadrupole moment
dema îcadkirinê yan keşfê	1992
parity	+

decay mode	intensity
β⁻ (β⁻ decay)	100%
β⁻ n (β⁻-delayed neutron emission)	28%
2n (2-neutron emission)

¹⁰²Rb

Hejmara baristeyî	102
neutron number	65
Giraniya Atomê	101,960008 ± 0,000089 Da
g-factor
natural abundance
radioactivity	☢️ radioactive element
half-life	37 ± 4 ms
spin	4
nuclear quadrupole moment
dema îcadkirinê yan keşfê	1995
parity	+

decay mode	intensity
β⁻ (β⁻ decay)	100%
β⁻ n (β⁻-delayed neutron emission)	65%
2n (2-neutron emission)

¹⁰³Rb

Hejmara baristeyî	103
neutron number	66
Giraniya Atomê	102,964401 ± 0,000429 Da
g-factor
natural abundance
radioactivity	☢️ radioactive element
half-life	26 ± 11 ms
spin	3/2
nuclear quadrupole moment
dema îcadkirinê yan keşfê	2010
parity	+

decay mode	intensity
β⁻ (β⁻ decay)	100%
β⁻ n (β⁻-delayed neutron emission)
2n (2-neutron emission)

¹⁰⁴Rb

Hejmara baristeyî	104
neutron number	67
Giraniya Atomê	103,970531 ± 0,000537 Da
g-factor
natural abundance
radioactivity	☢️ radioactive element
half-life
spin
nuclear quadrupole moment
dema îcadkirinê yan keşfê	2018
parity

decay mode	intensity
β⁻ (β⁻ decay)
β⁻ n (β⁻-delayed neutron emission)
2n (2-neutron emission)

dîrok

kaşîf an îcadker	R. Bunsen, G. Kirchoff
location of discovery	Germany
dema îcadkirinê yan keşfê	1861
Bêjenasî	Latin: rubidus (deep red); the color its salts impart to flames.
pronunciation	roo-BID-i-em (îngilîzî)

source

Abundance
Abundance in Earth's crust	90 mg/kg
natural abundance (Okyanûs)	0,12 mg/L
natural abundance (human body)	0,00046 %
natural abundance (meteoroid)	0,00032 %
natural abundance (Roj)	0,000003 %
Abundance in Universe	0,000001 %

Nuclear Screening Constants

1	s	0.7922
2	p	3.9612
2	s	9.8432
3	d	15.3208
3	p	15.6967
3	s	15.1573
4	p	26.1192
4	s	24.612
5	s	32.0155

Rûbîdyûm on ChemicalAid

AEDA subject keyword ID	17540
Art & Architecture Thesaurus ID	300380179
Australian Educational Vocabulary ID	scot/3568
Bibliothèque nationale de France ID	12165566c
Brockhaus Enzyklopädie online ID	rubidium
CAB ID	18779
CAS Registry Number	7440-17-7
CPV Supplementary	AA35
ChEBI ID	33322
ChemSpider ID	4512975
Common Procurement Vocabulary	14773000
DSSTOX compound identifier	DTXCID6047650
DSSTox substance ID	DTXSID4064686
Den Store Danske ID	rubidium
DrugBank ID	11346
ECHA Substance Infocard ID	100.028.296
Elhuyar ZTH ID	030348
Encyclopædia Britannica Online ID	science/rubidium
Encyclopædia Universalis ID	rubidium
Fandom article ID	sto:Rubidium
Freebase ID	/m/025sckv
French Vikidia ID	Rubidium
GND ID	4178576-9
Golden ID	Rubidium-EAWB8
Gran Enciclopèdia Catalana ID	0140247
Great Russian Encyclopedia Online ID	3517702
InChI	InChI=1S/Rb
InChIKey	IGLNJRXAVVLDKE-UHFFFAOYSA-N
KBpedia ID	Rubidium
Krugosvet article	nauka_i_tehnika/himiya/RUBIDI.html
Library of Congress authority ID	sh85115684
MeSH descriptor ID	D012413
Mindat mineral ID	52496
NE.se ID	rubidium
Namuwiki ID	루비듐
National Library of Israel J9U ID	987007546156605171
OmegaWiki Defined Meaning	158318
OpenAlex ID	C526903357
PSH ID	5747
Probes And Drugs ID	PD077494
PubChem CID	5357696
Quora topic ID	Rubidium
RxNorm ID	1311489
Store norske leksikon ID	rubidium
Treccani ID	rubidio
UNII	MLT4718TJW
USGS Thesaurus ID	1562
WordNet 3.1 Synset ID	14677133-n
YSO ID	38859
ZVG number	7370

Rûbîdyûm (Rb)

Physical Property

Chemical Property

other

Isotopes of Rubidium

71Rb

72Rb

73Rb

74Rb

75Rb

76Rb

77Rb

78Rb

79Rb

80Rb

81Rb

82Rb

83Rb

84Rb

85Rb

86Rb

87Rb

88Rb

89Rb

90Rb

91Rb

92Rb

93Rb

94Rb

95Rb

96Rb

97Rb

98Rb

99Rb

100Rb

101Rb

102Rb

103Rb

104Rb

dîrok

source

Nuclear Screening Constants

⁷¹Rb

⁷²Rb

⁷³Rb

⁷⁴Rb

⁷⁵Rb

⁷⁶Rb

⁷⁷Rb

⁷⁸Rb

⁷⁹Rb

⁸⁰Rb

⁸¹Rb

⁸²Rb

⁸³Rb

⁸⁴Rb

⁸⁵Rb

⁸⁶Rb

⁸⁷Rb

⁸⁸Rb

⁸⁹Rb

⁹⁰Rb

⁹¹Rb

⁹²Rb

⁹³Rb

⁹⁴Rb

⁹⁵Rb

⁹⁶Rb

⁹⁷Rb

⁹⁸Rb

⁹⁹Rb

¹⁰⁰Rb

¹⁰¹Rb

¹⁰²Rb

¹⁰³Rb

¹⁰⁴Rb