Protactinijum, ²Protaktinij (Pa)

hemijski element sa simbolom Pa i atomskim brojem 91

Atomic Number	91
Atomic Weight	231.03588
Maseni broj	231

Group
Period	7
Block	f

Proton	91 p⁺
Neutron	140 n⁰
Elektron	91 e^-

Animated Bohrov model atoma of Pa (Protactinijum, ²Protaktinij)

Physical Property

Atomski Radijus	180 pm 285 pm
Molarni volumen	15 cm³/mol
covalent radius	169 pm 138 pm 129 pm 200 pm
Metallic Radius
Ionski radijus	104 pm 90 pm 101 pm 78 pm 91 pm 95 pm 119,9 pm
Crystal Radius	118 pm 104 pm 115 pm 92 pm 105 pm 109 pm 133,9 pm
Van der Waalsov radijus	243 pm 264 pm 342,4 pm
gustoća	15,4 g/cm³

Chemical Property

energija

proton affinity
electron affinity
ionization energy	5,89 eV/particle 11,9 eV/particle 19 eV/particle 30,9 eV/particle 44,3 eV/particle 72 eV/particle 85,1 eV/particle 98,9 eV/particle 111 eV/particle 137 eV/particle 153 eV/particle 187 eV/particle 203 eV/particle 292 eV/particle 316 eV/particle 342 eV/particle 369 eV/particle 395 eV/particle 423 eV/particle 460 eV/particle 488 eV/particle 518 eV/particle 546 eV/particle 690 eV/particle 720 eV/particle 760 eV/particle 790 eV/particle 880 eV/particle 920 eV/particle 1.020 eV/particle 1.060 eV/particle 1.150 eV/particle 1.220 eV/particle 1.300 eV/particle 1.370 eV/particle 1.450 eV/particle 1.520 eV/particle 1.600 eV/particle 1.670 eV/particle 1.760 eV/particle 1.830 eV/particle 1.910 eV/particle 2.000 eV/particle 2.060 eV/particle 2.130 eV/particle 2.483 eV/particle 2.550 eV/particle 2.620 eV/particle 2.696 eV/particle 2.766 eV/particle 2.837 eV/particle 2.968 eV/particle 3.040 eV/particle 3.119 eV/particle 3.193 eV/particle 3.488 eV/particle 3.558 eV/particle 3.637 eV/particle 3.709 eV/particle 4.077 eV/particle 4.161 eV/particle 4.370 eV/particle 4.454 eV/particle 7.181 eV/particle 7.341 eV/particle 7.510 eV/particle 7.690 eV/particle 7.870 eV/particle 8.040 eV/particle 8.410 eV/particle 8.590 eV/particle 8.780 eV/particle 8.960 eV/particle 9.460 eV/particle 9.620 eV/particle 9.790 eV/particle 9.950 eV/particle 11.100 eV/particle 11.280 eV/particle 11.660 eV/particle 11.840 eV/particle 24.660 eV/particle 25.080 eV/particle 25.540 eV/particle 25.970 eV/particle 30.230 eV/particle 30.800 eV/particle 31.520 eV/particle 31.971,6 eV/particle 126.296,6 eV/particle 128.507 eV/particle

Toplota isparavanja	481,2 kJ/mol
toplota topljenja	16,7 kJ/mol
standard enthalpy of formation	563 kJ/mol
Elektron

electron shell	2, 8, 18, 32, 20, 9, 2

Valentni elektron	2 ⓘ

electron configuration	[Rn] 5f² 6d¹ 7s²ⓘ 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁶ 5s² 4d¹⁰ 5p⁶ 6s² 4f¹⁴ 5d¹⁰ 6p⁶ 5f² 6d¹ 7s²

oksidacijsko stanje	2, 3, 4, 5
Elektronegativnost	0.12149 1.5
Electrophilicity Index
fundamental state of matter

agregatno stanje	Solid
gaseous state of matter
Boiling Point
Melting Point	1.845,15 K
critical pressure
Kritična temperatura
Trojna tačka
appearance
boja	Silver #ffffff #00a1ff #00a1ff
appearance	bright, silvery metallic luster
Indeks prelamanja
thermodynamic material property
Thermal Conductivity
thermal expansion
molar heat capacity
Specific Heat Capacity
heat capacity ratio
electrical properties
type	Conductor
Specifična električna provodljivost	5,6 MS/m
electrical resistivity	0,00000018 Ω*m
Superprovodljivost	1,41 K
Magnetizam
type	paramagnetic
magnetic susceptibility (Mass)	0,0000000325 m³/Kg
magnetic susceptibility (Molar)	0,000000007509 m³/mol
magnetic susceptibility (Volume)	0,0004995
magnetic ordering
Kirijeva tačka
Néel temperature
struktura
Crystal Structure	Centered Tetragonal (TET)
lattice constant	3,92 Å
Lattice Angles	π/2, π/2, π/2
mechanical property
Tvrdoća
bulk modulus
shear modulus
Young's modulus
Poisson's ratio
Brzina zvuka
klasifikacija
Category	Actinides, Actinides
CAS Group
IUPAC Group
Glawe Number	35
Mendeleev Number	18
Pettifor Number	46
Geochemical Class	U/Th decay series
Goldschmidt classification	litophile

other

Gas Basicity
polarizability	154 ± 20 a₀
C6 Dispersion Coefficient
allotrope
Neutron cross section	200
Neutron Mass Absorption
Kvantni brojevi	4K11/2
space group	139 (I4/mmm)

Isotopes of Protactinium

Stable Isotopes	0
Unstable Isotopes	31
Natural Isotopes	1

²¹¹Pa

Maseni broj	211
broj neutrona	120
Relative Atomic Mass	211,023674036 ± 0,000074581 Da
g-factor
natural abundance
Radioaktivnost	☢️ radioactive element
Vrijeme poluraspada	6 ± 3 ms
spin	9/2
nuclear quadrupole moment
datum otkrića	2006
parity	-

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

²¹²Pa

Maseni broj	212
broj neutrona	121
Relative Atomic Mass	212,023184819 ± 0,000094047 Da
g-factor
natural abundance
Radioaktivnost	☢️ radioactive element
Vrijeme poluraspada	5,8 ± 1,9 ms
spin	3
nuclear quadrupole moment
datum otkrića	1997
parity	+

decay mode	intensity
α (α emission)	100%

²¹³Pa

Maseni broj	213
broj neutrona	122
Relative Atomic Mass	213,021099644 ± 0,000061374 Da
g-factor
natural abundance
Radioaktivnost	☢️ radioactive element
Vrijeme poluraspada	7,4 ± 2,4 ms
spin	9/2
nuclear quadrupole moment
datum otkrića	1995
parity	-

decay mode	intensity
α (α emission)	100%

²¹⁴Pa

Maseni broj	214
broj neutrona	123
Relative Atomic Mass	214,020891055 ± 0,00008718 Da
g-factor
natural abundance
Radioaktivnost	☢️ radioactive element
Vrijeme poluraspada	17 ± 3 ms
spin	7
nuclear quadrupole moment
datum otkrića	1995
parity	+

decay mode	intensity
α (α emission)	100%

²¹⁵Pa

Maseni broj	215
broj neutrona	124
Relative Atomic Mass	215,019113955 ± 0,000088513 Da
g-factor
natural abundance
Radioaktivnost	☢️ radioactive element
Vrijeme poluraspada	14 ± 2 ms
spin	9/2
nuclear quadrupole moment
datum otkrića	1979
parity	-

decay mode	intensity
α (α emission)	100%

²¹⁶Pa

Maseni broj	216
broj neutrona	125
Relative Atomic Mass	216,019134633 ± 0,000026459 Da
g-factor
natural abundance
Radioaktivnost	☢️ radioactive element
Vrijeme poluraspada	105 ± 12 ms
spin	5
nuclear quadrupole moment
datum otkrića	1972
parity	+

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

²¹⁷Pa

Maseni broj	217
broj neutrona	126
Relative Atomic Mass	217,018309024 ± 0,000013417 Da
g-factor
natural abundance
Radioaktivnost	☢️ radioactive element
Vrijeme poluraspada	3,8 ± 0,2 ms
spin	9/2
nuclear quadrupole moment
datum otkrića	1968
parity	-

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

²¹⁸Pa

Maseni broj	218
broj neutrona	127
Relative Atomic Mass	218,020021133 ± 0,000019158 Da
g-factor
natural abundance
Radioaktivnost	☢️ radioactive element
Vrijeme poluraspada	108 ± 5 us
spin	8
nuclear quadrupole moment
datum otkrića	1979
parity	-

decay mode	intensity
α (α emission)	100%

²¹⁹Pa

Maseni broj	219
broj neutrona	128
Relative Atomic Mass	219,019949909 ± 0,000074831 Da
g-factor
natural abundance
Radioaktivnost	☢️ radioactive element
Vrijeme poluraspada	56 ± 9 ns
spin	9/2
nuclear quadrupole moment
datum otkrića	2005
parity	-

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

²²⁰Pa

Maseni broj	220
broj neutrona	129
Relative Atomic Mass	220,021769753 ± 0,000015732 Da
g-factor
natural abundance
Radioaktivnost	☢️ radioactive element
Vrijeme poluraspada	0,85 ± 0,06 us
spin	1
nuclear quadrupole moment
datum otkrića	2005
parity	-

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

²²¹Pa

Maseni broj	221
broj neutrona	130
Relative Atomic Mass	221,021873393 ± 0,000063746 Da
g-factor
natural abundance
Radioaktivnost	☢️ radioactive element
Vrijeme poluraspada	5,9 ± 1,7 us
spin	9/2
nuclear quadrupole moment
datum otkrića	1983
parity	-

decay mode	intensity
α (α emission)	100%

²²²Pa

Maseni broj	222
broj neutrona	131
Relative Atomic Mass	222,023687064 ± 0,000092975 Da
g-factor
natural abundance
Radioaktivnost	☢️ radioactive element
Vrijeme poluraspada	3,8 ± 0,2 ms
spin	1
nuclear quadrupole moment
datum otkrića	1970
parity	-

decay mode	intensity
α (α emission)	100%

²²³Pa

Maseni broj	223
broj neutrona	132
Relative Atomic Mass	223,023980414 ± 0,000081193 Da
g-factor
natural abundance
Radioaktivnost	☢️ radioactive element
Vrijeme poluraspada	5,3 ± 0,3 ms
spin	9/2
nuclear quadrupole moment
datum otkrića	1970
parity	-

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

²²⁴Pa

Maseni broj	224
broj neutrona	133
Relative Atomic Mass	224,025617286 ± 0,000008145 Da
g-factor
natural abundance
Radioaktivnost	☢️ radioactive element
Vrijeme poluraspada	844 ± 19 ms
spin	5
nuclear quadrupole moment
datum otkrića	1958
parity	-

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

²²⁵Pa

Maseni broj	225
broj neutrona	134
Relative Atomic Mass	225,026147927 ± 0,000087887 Da
g-factor
natural abundance
Radioaktivnost	☢️ radioactive element
Vrijeme poluraspada	1,71 ± 0,1 s
spin	5/2
nuclear quadrupole moment
datum otkrića	1958
parity	-

decay mode	intensity
α (α emission)	100%

²²⁶Pa

Maseni broj	226
broj neutrona	135
Relative Atomic Mass	226,027948217 ± 0,000012037 Da
g-factor
natural abundance
Radioaktivnost	☢️ radioactive element
Vrijeme poluraspada	1,8 ± 0,2 m
spin	1
nuclear quadrupole moment
datum otkrića	1949
parity	-

decay mode	intensity
α (α emission)	74%
β⁺ (β⁺ decay; β⁺ = ϵ + e⁺)	26%

²²⁷Pa

Maseni broj	227
broj neutrona	136
Relative Atomic Mass	227,028803586 ± 0,000007797 Da
g-factor
natural abundance
Radioaktivnost	☢️ radioactive element
Vrijeme poluraspada	38,3 ± 0,3 m
spin	5/2
nuclear quadrupole moment
datum otkrića	1948
parity	-

decay mode	intensity
α (α emission)	85%
ϵ (electron capture)	15%

²²⁸Pa

Maseni broj	228
broj neutrona	137
Relative Atomic Mass	228,031050758 ± 0,000004659 Da
g-factor	1,1666666666667 ± 0,16666666666667
natural abundance
Radioaktivnost	☢️ radioactive element
Vrijeme poluraspada	22 ± 1 h
spin	3
nuclear quadrupole moment
datum otkrića	1948
parity	+

decay mode	intensity
β⁺ (β⁺ decay; β⁺ = ϵ + e⁺)	98.15%
α (α emission)	1.85%

²²⁹Pa

Maseni broj	229
broj neutrona	138
Relative Atomic Mass	229,032095585 ± 0,000003521 Da
g-factor
natural abundance
Radioaktivnost	☢️ radioactive element
Vrijeme poluraspada	1,55 ± 0,04 d
spin	5/2
nuclear quadrupole moment
datum otkrića	1949
parity	+

decay mode	intensity
ϵ (electron capture)	99.51%
α (α emission)	0.49%

²³⁰Pa

Maseni broj	230
broj neutrona	139
Relative Atomic Mass	230,034539717 ± 0,000003261 Da
g-factor	1 ± 0,1
natural abundance
Radioaktivnost	☢️ radioactive element
Vrijeme poluraspada	17,4 ± 0,5 d
spin	2
nuclear quadrupole moment
datum otkrića	1948
parity	-

decay mode	intensity
β⁺ (β⁺ decay; β⁺ = ϵ + e⁺)	92.2%
β⁻ (β⁻ decay)	7.8%
α (α emission)	0.0032%

²³¹Pa

Maseni broj	231
broj neutrona	140
Relative Atomic Mass	231,0358825 ± 0,000001901 Da
g-factor	1,3266666666667 ± 0,013333333333333
natural abundance	100
Radioaktivnost	☢️ radioactive element
Vrijeme poluraspada	32,65 ± 0,2 ky
spin	3/2
nuclear quadrupole moment	-1,72 ± 0,05
datum otkrića	1918
parity	-

decay mode	intensity
α (α emission)	100%
SF (spontaneous fission)	3%
24Ne (heavy cluster emission)	13.4%
23F	9.9%

²³²Pa

Maseni broj	232
broj neutrona	141
Relative Atomic Mass	232,038590205 ± 0,000008206 Da
g-factor
natural abundance
Radioaktivnost	☢️ radioactive element
Vrijeme poluraspada	1,32 ± 0,02 d
spin	2
nuclear quadrupole moment
datum otkrića	1949
parity	-

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

²³³Pa

Maseni broj	233
broj neutrona	142
Relative Atomic Mass	233,040246535 ± 0,000001433 Da
g-factor	2,6666666666667 ± 0,46666666666667
natural abundance
Radioaktivnost	☢️ radioactive element
Vrijeme poluraspada	26,975 ± 0,013 d
spin	3/2
nuclear quadrupole moment	-3 ± 0,4
datum otkrića	1938
parity	-

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

²³⁴Pa

Maseni broj	234
broj neutrona	143
Relative Atomic Mass	234,043305555 ± 0,000004395 Da
g-factor
natural abundance
Radioaktivnost	☢️ radioactive element
Vrijeme poluraspada	6,7 ± 0,05 h
spin	4
nuclear quadrupole moment
datum otkrića	1913
parity	+

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

²³⁵Pa

Maseni broj	235
broj neutrona	144
Relative Atomic Mass	235,045399 ± 0,000015 Da
g-factor
natural abundance
Radioaktivnost	☢️ radioactive element
Vrijeme poluraspada	24,4 ± 0,2 m
spin	3/2
nuclear quadrupole moment
datum otkrića	1950
parity	-

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

²³⁶Pa

Maseni broj	236
broj neutrona	145
Relative Atomic Mass	236,048668 ± 0,000015 Da
g-factor
natural abundance
Radioaktivnost	☢️ radioactive element
Vrijeme poluraspada	9,1 ± 0,1 m
spin	1
nuclear quadrupole moment
datum otkrića	1963
parity

decay mode	intensity
β⁻ (β⁻ decay)	100%
β⁻ SF (β⁻-delayed fission)	6%

²³⁷Pa

Maseni broj	237
broj neutrona	146
Relative Atomic Mass	237,051023 ± 0,000014 Da
g-factor
natural abundance
Radioaktivnost	☢️ radioactive element
Vrijeme poluraspada	8,7 ± 0,2 m
spin	1/2
nuclear quadrupole moment	0
datum otkrića	1954
parity	+

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

²³⁸Pa

Maseni broj	238
broj neutrona	147
Relative Atomic Mass	238,054637 ± 0,000017 Da
g-factor
natural abundance
Radioaktivnost	☢️ radioactive element
Vrijeme poluraspada	2,28 ± 0,09 m
spin	3
nuclear quadrupole moment
datum otkrića	1968
parity	-

decay mode	intensity
β⁻ (β⁻ decay)	100%
β⁻ SF (β⁻-delayed fission)	2.6%

²³⁹Pa

Maseni broj	239
broj neutrona	148
Relative Atomic Mass	239,05726 ± 0,00021 Da
g-factor
natural abundance
Radioaktivnost	☢️ radioactive element
Vrijeme poluraspada	1,8 ± 0,5 h
spin	1/2
nuclear quadrupole moment	0
datum otkrića	1995
parity	+

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

²⁴⁰Pa

Maseni broj	240
broj neutrona	149
Relative Atomic Mass	240,061203 ± 0,000215 Da
g-factor
natural abundance
Radioaktivnost	☢️ radioactive element
Vrijeme poluraspada
spin	3
nuclear quadrupole moment
datum otkrića
parity	+

decay mode	intensity
β⁻ (β⁻ decay)

²⁴¹Pa

Maseni broj	241
broj neutrona	150
Relative Atomic Mass	241,064134 ± 0,000322 Da
g-factor
natural abundance
Radioaktivnost	☢️ radioactive element
Vrijeme poluraspada
spin	1/2
nuclear quadrupole moment	0
datum otkrića
parity	+

decay mode	intensity
β⁻ (β⁻ decay)

historija

otkrivač ili izumitelj	Fredrich Soddy, John Cranston, Otto Hahn, Lise Meitner
mjesto otkrića	England/France
datum otkrića	1917
Etimologija	Greek: proto and actinium (parent of actinium); it forms actinium when it radioactively decays.
pronunciation	PRO-tak-tin-eh-em (engleski)

izvor

Abundance
Abundance in Earth's crust	0,0000014 mg/kg
natural abundance (okean)	0,00000000005 mg/L
natural abundance (ljudsko tijelo)	0 %
natural abundance (Meteoroidi)
natural abundance (Sunce)
Abundance in Universe	0 %

Nuclear Screening Constants

Protactinijum, ²Protaktinij on ChemicalAid

Australian Educational Vocabulary ID	scot/3563
CAB ID	7539
CAS broj	7440-13-3
ChEBI ID	33386
ChemSpider ID	22387
DSSTOX compound identifier	DTXCID50147878
DSSTox substance ID	DTXSID50225387
Den Store Danske ID	protactinium
ECHA Substance Infocard ID	100.122.906
Elhuyar ZTH ID	030190
Encyclopedia of China ID (Second Edition)	224618
Encyclopædia Britannica Online ID	science/protactinium
Encyclopædia Universalis ID	protactinium
French Vikidia ID	Protactinium
GND	4175981-3
Gran Enciclopèdia Catalana ID	0135204
Great Russian Encyclopedia Online ID	3168919
ID Quora teme	Protactinium
ID na KBpediji	Protactinium
InChIKey	XLROVYAPLOFLNU-UHFFFAOYSA-N
InChl	InChI=1S/Pa
LCCN	sh85107634
MeSH ID	D011478
NALT ID	3207
Namuwiki ID	프로트악티늄
National Library of Israel J9U ID	987007541390005171
OmegaWiki određeno značenje	345414
OpenAlex ID	C505015426
PubChem ID (CID)	23945
Römpp online ID	RD-16-04500
Store norske leksikon ID	protactinium
Treccani ID	protoattinio
UNII	0S6855V29M
USGS Thesaurus ID	1547
WordNet 3.1 Synset ID	14675887-n
broj na Freebaseu	/m/025s7xw

Protactinijum, ²Protaktinij (Pa)

Physical Property

Chemical Property

other

Isotopes of Protactinium

211Pa

212Pa

213Pa

214Pa

215Pa

216Pa

217Pa

218Pa

219Pa

220Pa

221Pa

222Pa

223Pa

224Pa

225Pa

226Pa

227Pa

228Pa

229Pa

230Pa

231Pa

232Pa

233Pa

234Pa

235Pa

236Pa

237Pa

238Pa

239Pa

240Pa

241Pa

historija

izvor

Nuclear Screening Constants

²¹¹Pa

²¹²Pa

²¹³Pa

²¹⁴Pa

²¹⁵Pa

²¹⁶Pa

²¹⁷Pa

²¹⁸Pa

²¹⁹Pa

²²⁰Pa

²²¹Pa

²²²Pa

²²³Pa

²²⁴Pa

²²⁵Pa

²²⁶Pa

²²⁷Pa

²²⁸Pa

²²⁹Pa

²³⁰Pa

²³¹Pa

²³²Pa

²³³Pa

²³⁴Pa

²³⁵Pa

²³⁶Pa

²³⁷Pa

²³⁸Pa

²³⁹Pa

²⁴⁰Pa

²⁴¹Pa